How do you prevent caravan tyre blowouts?
You prevent caravan tyre blowouts by keeping cold pressure on the placard, replacing tyres on age (not just tread), staying under 90% of your combined tyre load rating, holding to 100 km/h, fitting a tyre pressure monitoring system, walking around the rig at every fuel stop, and watching wheel bearing temperatures. Roughly three-quarters of caravan blowouts trace back to one root cause — under-inflated rubber building heat until it fails — and that one cause is the easiest of all to catch early.
The seven tips below cover what to check, when to check it, and what the actual numbers should look like for an Australian rig in 2026. They're written for the kind of owner who tows fortnight-on, fortnight-off, has had at least one mate come off a tyre, and wants the next thousand kilometres to be uneventful. If you also want the broader pre-trip workflow, read our complete pre-trip caravan safety checklist — this article is the deep dive on the tyre half of that list.
What actually causes a caravan tyre blowout?
Around 75% of caravan tyre blowouts start with low pressure. The mechanism is mechanical, not mysterious: an under-inflated tyre flexes more than it should as it rotates, the flex generates friction, the friction generates heat, and the heat slowly degrades the bond between the rubber and the steel belts inside the carcass. Once that bond goes, the tread peels off the casing or the sidewall splits, and the tyre lets go — usually at the worst possible moment, which is highway speed on a hot afternoon with a fully loaded van behind you.
The other 25% of blowouts come from impact damage (rocks, kerbs, potholes), foreign objects (screws, sharp debris), and pure overloading that mimics under-inflation. Overloading is the hidden one — the tyre is at the right PSI on paper, but it's carrying more weight than that PSI was rated for, so it behaves like an under-inflated tyre.
Caravans concentrate every risk factor in one rig. Long highway runs let heat compound. Months of stationary parking expose rubber to UV. Heavy GTM puts the tyre near the upper end of its load rating before you've added water tanks and recovery gear. And most caravan tyres are several years older than the tow vehicle's tyres because they don't see daily use, so the tread looks fine while the rubber underneath is well past its prime.
There are now more than 502,000 caravans and campervans registered in Australia, and the fleet has grown by 21% since 2019. That's a lot of rigs running on tyres that were last looked at in proper detail when they came off the showroom floor. The seven tips below are the ones that catch problems before they catch you.
Tip #1 — Run the right cold pressure (every single time)
"Cold" means the tyre has been parked for at least three hours and hasn't been driven on, sat in direct sun, or come off a long highway leg. A cold pressure reading is the only one that compares to the placard. A tyre coming off a 200 km run in 35°C ambient can read 6-8 PSI higher than its cold equivalent, and adjusting to that hot reading guarantees you'll be under-inflated tomorrow morning.
Find the placard pressure on the caravan's compliance plate or on the inside of the A-frame storage hatch. Most Australian caravan placards specify between 50 and 65 PSI for laden touring, depending on the tyre's load index and the van's GTM. The figure on the sidewall is the maximum cold pressure the tyre can hold — it is not the recommended running pressure.
On the tow vehicle, run the manufacturer's laden placard. With a heavy ball weight and a fully kitted out tray, that's typically 2-4 PSI higher on the rear axle than the unladen figure. Don't guess.
The schedule that actually catches problems:
- Every two weeks at home, even when the van's parked
- Morning of every trip, before the sun hits the rubber
- Every fuel stop on a trip (cold-ish at minimum — same conditions across all six wheels)
- Bottom of every long descent (heat plus brake spray hides slow leaks)
For more on cadence and why fortnightly is the floor, not the ceiling, see how often to check caravan tyre pressure.
One more detail most owners miss. PSI drops by roughly 1 PSI for every 5°C drop in ambient temperature. A van set to placard at 30°C in February will read 4-5 PSI low at 5°C on a winter morning in Bright. Re-check seasonally.
Tip #2 — Replace tyres on age, not just on tread
Caravan tyres age out before they wear out. A van that does 8,000 km a year still has half its tread depth at the seven-year mark, and that's exactly the tyre you want to retire. The reason is rubber chemistry, not depth measurement.
The 5/10 rule is the industry standard:
- From year 5: annual professional inspection is mandatory regardless of how the tyre looks
- By year 10: the tyre comes off the rig regardless of tread, regardless of appearance, regardless of how few kilometres it's done
Tyre manufacturers and most Australian tyre retailers recommend replacement somewhere in the 5-7 year band even with full tread, because UV exposure, oxygen, heat cycles and time slowly harden the rubber and weaken the bond between rubber and steel. A hardened tyre slides further under braking, grips less in cornering, and is much more prone to letting go under heat.
There is no Australian law that mandates a maximum tyre age. There is only the requirement that tyres be free of defects and have adequate tread, which is a much lower bar than the 5/10 rule. If you're towing a $90,000 van behind a $70,000 4WD, the cost of a fresh set of LT tyres is the cheapest insurance on the rig.
Reading the DOT date code
Every tyre carries a four-digit date code stamped into the sidewall, preceded by the letters DOT. The last four digits are what you want.
- First two digits: week of manufacture (01-52)
- Last two digits: year of manufacture
A code reading 4221 means week 42 of 2021 — a tyre that hits its 5-year inspection cliff in October 2026. Get under the van with a torch and check every tyre, including the spare. Spares are notorious for being older than the road tyres because they never get rotated.
Tip #3 — Stay under 90% of your tyre's load capacity
Every tyre's sidewall carries a load index — a two- or three-digit number that translates to a maximum kilogram rating per tyre at maximum cold pressure. A load index of 109 means 1,030 kg per tyre. A single-axle van running 109-rated tyres has a combined road-going capacity of 2,060 kg before the spare counts.
The rule of thumb is to keep your loaded GTM at 85-90% of that combined rating. Run two 1,030 kg tyres on a van whose GTM consistently hits 1,950 kg, and you're at 95% — too close to the line for safety, and well into the territory where small under-inflation or a hot afternoon takes the tyre over the edge.
Why does load matter for blowout risk? Because a tyre carrying more weight than its PSI was rated for behaves like an under-inflated tyre. The contact patch flattens, the sidewall flexes harder, internal heat rises, and the same heat-and-flex cycle that causes a low-pressure blowout takes hold. Two tyres at correct PSI on a 5% overloaded van are not safe. They're a slow-motion failure waiting for the right ambient temperature.
The Australian enforcement data is sobering. In recent NHVR and Queensland Police roadside weighing operations, around 70% of caravans pulled in were over their legal weight, and a separate NSW program found close to 40% of vans overloaded. If those rigs run far enough, on a hot enough day, the tyres will tell.
The fix is straightforward. Get the loaded rig on a public weighbridge after a shakedown trip. Re-weigh annually. Match the actual GTM against the combined tyre rating, and if you're above 90%, either lighten the van or upgrade to a higher load-index tyre.
ATM and GTM are different numbers. ATM is the total weight of an unhitched van. GTM is what the caravan's own wheels carry when it's hitched. Tyre load math is done against GTM, because that's the figure the tyres actually support — the tow ball mass goes onto the tow vehicle.
Tip #4 — Know your speed ceiling (and respect it)
Australia doesn't have a single national towing speed limit, and that fact has caused more confusion than it should. The practical answer is that 100 km/h is the working ceiling for nearly every caravan setup on the road, and you should know exactly why.
State-by-state, the rules look like this. Western Australia caps caravan towing at 100 km/h regardless of mass. New South Wales applies a 100 km/h ceiling to any combination over 4.5 tonnes — which is most laden caravan setups. Victoria, Queensland, Tasmania, South Australia, the Northern Territory and the ACT all let you run to the posted limit, but most caravan tyres carry speed ratings that cap you well below the freeway max anyway.
Tyre speed ratings are a code on the sidewall:
- L = 120 km/h
- M = 130 km/h
- N = 140 km/h
A van fitted with L-rated tyres has zero margin above 100 km/h on a Victorian freeway — and a fully loaded L-rated tyre running at 110 km/h on a 35°C bitumen surface is in the danger zone. Speed compounds the heat problem from Tip 1: every additional 10 km/h means meaningfully more flex per minute, more friction, more internal temperature.
There's also a handling reason to stay at 100. Sway and yaw forces on a hitched rig rise with the square of speed. A van that feels acceptable at 80 km/h is four times less stable at 100 km/h, and overspeed sway events are the single largest cause of caravan crashes in Australia. Industry analysis attributes around 91% of caravan accidents to sway-related loss of control, with overspeed and overloading as the main triggers.
If you exceed manufacturer-recommended speeds, your insurance can refuse a claim after a tyre or stability incident. Most policies include a duty-of-care clause that doesn't survive a speeding ticket on the day.
Tip #5 — Use a TPMS for live pressure and temperature data
A tyre that's about to fail almost always tells you it's failing. Pressure starts dropping 5 to 30 minutes before the blowout, and tyre temperature climbs in step. The problem is that you can't see either of those signals from the driver's seat. By the time you notice smoke in the side mirror or hear the wheel arch being shredded, the failure is already in progress, and what comes next is bodywork, electrical and chassis repairs that run into the thousands.
A tyre pressure monitoring system closes that gap. TPMS sensors sit on each valve stem (and optionally on each hub) and beam pressure and temperature data to a display in the cab every few minutes. If a tyre starts trending down 5 PSI over five minutes, the alarm fires before the failure does — usually with enough warning to ease off the throttle, signal, and pull over before the carcass lets go.
The effectiveness data is solid. The US National Highway Traffic Safety Administration ran a 6,103-vehicle study (DOT HS 811 681, 2012) and found that vehicles fitted with TPMS were 56% less likely to have one or more severely under-inflated tyres at any given point. Severe under-inflation in that study meant 25% or more below placard, which is precisely the band where heat-and-flex failure becomes likely.
In Australia, TPMS isn't legally required on caravans (or anything else, for that matter). It's voluntary fitment, which means caravans almost never come with factory TPMS. An aftermarket system is the only practical way to get continuous monitoring across both the tow vehicle and the van.
The iCheckTPMS approach is built around three pieces of technology designed for towing setups specifically. InstaData™ transmits data every five minutes whether the rig is moving or stationary — competitor sensors typically sleep below 25 km/h, so a slow leak that develops in the driveway only shows up once you're already on the highway. IntelliData™ auto-calibrates alarm thresholds at +25% and -15% of the cold benchmark when you screw on the sensors, so you don't have to manually configure 8-10 wheels at different pressures. On/Off Road Mode rebaselines those thresholds when you air down for sand or air back up for bitumen, with no reprogramming.
Most Australian caravan setups end up on the IC008 (eight sensors, suits a 4WD plus a single-axle van including spares) or the IC010 (ten sensors, suits a 4WD plus a dual-axle van). Both pair with the optional Wheel Bearing Sensor add-on, which we'll come to in Tip 7.
For a deeper feature comparison and decision framework on which kit suits which setup, read our Australian TPMS buyer's guide.
Tip #6 — Walk around and look (every fuel stop, every morning)
The 60-second visual check is the cheapest blowout-prevention tool there is, and most owners either skip it or do it badly. Here's the version that actually catches things.
Every morning before departure:
- Walk the full perimeter of the rig
- Look at each tyre from above (tread, embedded objects), from the side (sidewall cracks, bulges), and underneath at the inner sidewall with a torch
- Run your hand along each sidewall — soft spots and unusual bumps are easier to feel than to see
- Check tread depth with a 20¢ coin against the centre groove
Every fuel stop on a trip:
- Quick visual pass on all six tyres (four on the tow vehicle, two-to-four on the van plus the spare)
- Hand on each rim and hub for warmth check (more on this in Tip 7)
- Eyeball the spare — it's the one nobody checks until they need it
What you're looking for, in order of severity:
- Sidewall bulge or blister — replace the tyre immediately, do not drive on it. A bulge means an internal cord has ruptured and pressurised air is pushing the casing outward. The next stop is a blowout.
- Visible cords — illegal in Australia and physically unsafe. Replace.
- Cracks — fine surface cracking from UV is a sign the rubber is past its useful life; deep or radial cracks need professional inspection.
- Cuts and gouges — anything deeper than 2 mm needs assessment, especially on the sidewall where there's no steel belt to contain failure.
- Embedded objects — screws, nails, glass shards. Don't pull them; book a tyre shop.
- Uneven wear — centre wear means chronic over-inflation, edge wear means chronic under-inflation, single-edge wear points to alignment issues.
- Tread depth — the legal minimum in Australia is 1.5 mm. The practical minimum for a laden caravan in wet weather is 3 mm. Replace at 3 mm; don't try to milk another 5,000 km out of a worn tyre on a holiday rig.
The inside sidewall is where most overlooked damage hides. A kerb strike or a stone fired by the tow vehicle's rear tyres almost always lands on the inner face. Get under the van with a torch — it's a one-minute job and it catches what an outside-only walk-around misses.
The hand-temperature check
After 30 minutes of driving, every wheel should be uniformly warm. Not hot. Not cold. Lay the back of your hand against the rim (not the tyre — the rim transmits hub heat better) for two seconds. If one wheel is noticeably hotter than the others, you have a brake dragging, a bearing failing, or a tyre flexing more than it should. Investigate before you continue.
Tip #7 — Watch your wheel bearings (because hot bearings cook tyres)
This is the link almost no one connects. A failing wheel bearing generates a lot of heat — enough to glow the brake drum cherry-red in extreme cases — and that heat conducts through the hub, into the wheel rim, into the tyre bead, and into the lower sidewall. A tyre running at correct PSI on a perfectly loaded van will still fail if the bearing it sits next to is cooking off.
Wheel bearing failures are one of the leading causes of caravan fires in Australia, and the path to fire usually runs through a tyre. The bearing seizes, the hub temperature spikes, the tyre's bead area exceeds its safe operating temperature, and the rubber lets go — sometimes catastrophically, sometimes slowly enough to start a grass fire by the side of the road when the rig pulls over.
The traditional check is the hand-on-hub pre-trip and the hand-on-rim every fuel stop. Warm is fine; hot to touch is a problem; too hot to keep your hand on for two seconds is a fault that needs immediate attention. The trouble is that bearing failures often develop between fuel stops, not at them, and a bearing that was cool at the last servo can be glowing 90 minutes later.
iCheckTPMS developed hub-mounted temperature sensors specifically to close that monitoring gap. The sensors install onto each caravan hub and stream temperature data to the same TPMS display that's already showing tyre pressure and temperature. There is no integrated bearing temperature monitoring through a TPMS display from any other manufacturer in either the Australian or US market — it's the single most defensible piece of safety technology iCheckTPMS makes.
The Wheel Bearing Sensor comes in single-axle (two sensors) and dual-axle (four sensors) configurations and pairs with any IC005, IC008, or IC010 kit. Alert thresholds are user-configurable so you can tune them to your hub design and the conditions you tow in.
For the full picture on bearing failure modes, fire risk, and prevention, read our caravan wheel bearing failure guide.
What to do if a caravan tyre actually blows out
Even with all seven tips dialled in, blowouts happen. The two minutes that follow a blowout decide whether you walk away, whether the van walks away, and whether the rig avoids becoming a write-off.
Hands stay on the wheel. Both of them. The instinctive reaction is to grip harder; the harder reaction is to not steer at all. A blown tyre will pull the rig hard in one direction. Hold the wheel straight; don't try to correct.
Ease off the throttle gradually. Don't lift suddenly. Don't slam the brakes. Both of those transfer weight forward, off the trailer wheels, and start a sway event on top of the blowout. A long, gentle throttle bleed lets the rig slow itself.
Avoid the brake pedal until you're under 60 km/h. Below that speed, light brake input is fine. Above it, brakes invite sway.
Pull over only when you have control. A long shoulder is better than a short one. A slight uphill is better than a slight downhill. Do not stop on a curve.
Once stopped: hazard lights on, triangle out at 50 m, occupants well clear of the rig and well off the road. Call recovery — most caravan blowouts take out the wheel arch, the chassis, and sometimes the brake lines, and a roadside spare swap on a damaged van is rarely safe.
Frequently asked questions
What causes most caravan tyre blowouts?
Around 75% of caravan tyre blowouts are caused by low pressure. Under-inflation increases tyre flex, flex generates heat, and the heat slowly weakens the bond between the rubber and the steel belts inside the carcass until the tread peels off or the sidewall splits. The remaining 25% comes from impact damage, foreign objects, and overloading.
How often should I check caravan tyre pressure?
At least every two weeks at home, the morning of every trip, and at every fuel stop while you're towing. A TPMS automates all three by alerting you to pressure drops in real time. See the full schedule in our tyre pressure check frequency guide.
What pressure should caravan tyres run at?
Use the cold pressure listed on the caravan's compliance plate or VIN placard. Most Australian caravan placards specify between 50 and 65 PSI for laden touring, depending on tyre load index and the van's GTM. The maximum number on the sidewall is the absolute ceiling, not the recommended running pressure.
How old can a caravan tyre be?
Five years triggers mandatory annual professional inspection regardless of tread depth. Ten years is the absolute hard cap — every tyre comes off the rig at the ten-year mark, no exceptions. Read the date by finding the four-digit DOT code on the sidewall; the last four digits give you week and year of manufacture.
Does TPMS prevent blowouts?
TPMS doesn't physically stop a blowout, but it gives you a 5-30 minute warning window before one happens. The US NHTSA studied 6,103 vehicles and found that TPMS-equipped vehicles were 56% less likely to be running with severely under-inflated tyres — the exact condition that causes most blowouts.
Can a wheel bearing cause a tyre blowout?
Yes. A failing bearing transfers heat through the hub into the rim and then into the tyre bead and lower sidewall. A correctly inflated tyre on a correctly loaded van can still fail if the bearing alongside it is overheating. Hub-mounted temperature sensors are the only continuous-monitoring option.
Is a TPMS legally required on caravans in Australia?
No. TPMS is voluntary fitment in Australia, which is why caravans almost never come with factory-fitted systems. An aftermarket TPMS is the only practical way to get continuous pressure and temperature monitoring on a towed rig.
The Australian-engineered safeguard against tyre blowouts
iCheckTPMS designs and develops tyre pressure monitoring systems in Australia, for Australian conditions — laden caravans, hot bitumen, long highway runs, and off-road airing-down cycles that no factory-fitted TPMS was built to handle. The IC008 and IC010 kits cover most caravan setups, the optional Wheel Bearing Sensor closes the bearing-temperature gap, and the InstaData / IntelliData / On-Off Road Mode combination is built specifically around the way Australians actually tow.
If you've worked through all seven tips above and the only one missing from your rig is live monitoring, that's the easiest piece of the puzzle to fix — and the one that catches the other six when they slip.
