RV and Trailer TPMS: The Tyre You Cannot See A caravan tyre fails quietly behind the tow vehicle, and a blowout is how anyone finds out. Where a phone check fits.

The problem is that nobody is looking

On a motorhome or a caravan, the driver sits far from the tyres that matter. The rear tyres of a long trailer are invisible in the mirror, and a slow puncture gives no feedback through the chassis — the tow vehicle is heavy enough to hide it. The first symptom is often the blowout.

The causes are ordinary:

• Standing still for months. Caravans sit through a winter, tyres lose pressure, and the

first trip of the season starts on soft tyres.

• Load changes. Water tanks, gas bottles, bikes and luggage move the load every trip, and

pressure was set for the last configuration.

• Single-axle trailers are unforgiving. One soft tyre carries a large share of the load,

and the sidewall heats until it fails.

Where a phone-readable sensor fits

If the vehicle has no display and no wiring route to the trailer, our BLE sensor is the lowest-effort option: 2.4 GHz, no receiver, read on a phone, 0-500 kPa gauge, ±2 kPa, IP67, replaceable CR1632 cell good for about 1.5 years without re-pairing.

The honest scope is a pre-trip check: walk the van, read each wheel in a couple of minutes, record it. That catches the winter loss and the load-change mistake — which are the two failures that actually happen.

When you should use a receiver instead

If the trailer is towed weekly and the driver wants a live alarm while driving, a phone check is not enough: you need a receiver in the vehicle and a display or telemetry link. We build that system too — and for a fleet it is usually the right one.

What we will not do is describe a weekly phone check as "continuous monitoring". It is a different product with a different cost, and choosing the wrong one is how people conclude that TPMS "does not work".