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Internal vs External TPMS Sensors: Pros, Cons, and Which to Choose

If you're fitting a TPMS to a caravan, horse float, boat trailer, or any towed vehicle, external sensors are almost always the better choice. They're easier to install, simpler to maintain, and you can move them between vehicles in minutes. Internal sensors make more sense on passenger cars where they're factory-fitted and tucked out of sight. But "internal vs external" is only half the decision. What really matters is what the system does with the data once it has it.