Trailer tires without TPMS: how to catch a problem you cannot measure
Your tow vehicle probably warns you about its own tires. The trailer behind it, carrying the heaviest load in the whole combination, usually says nothing.
Why trailers are the blind spot
Pressure monitoring was mandated for passenger vehicles, not for trailers. So the axle doing the most work is the one you have the least information about. Aftermarket monitoring exists and is worth having, but it tells you a tire is losing pressure. It does not stop the loss.
The five minute habit
Cold pressures before every trip, with a gauge you trust rather than the one at the gas station. Walk the trailer and put a hand near each tire after the first hour of driving, because a tire that is much hotter than its neighbours is telling you something. Look for the small bright metal head of a screw in the tread while you are down there.
You cannot monitor what nobody fitted a sensor to. You can stop it leaking.
What you are actually looking for
Not a flat. You are looking for the beginning of a leak: a nail head, a stone lodged deep in a groove, a bulge, a bead of dirt around a puncture that has been weeping. These are all things a coating deals with at the moment of the puncture instead.
Removing the variable
A treated trailer set closes punctures as they are made, which means the thing you cannot measure mostly stops happening. It is the one change that works even when nobody remembers the pre-trip walk around.
Keep the habit anyway
Prevention is not permission to stop looking. Age, load and heat still matter, and a five minute check still catches things no coating addresses.
In short
Trailer sets are treated in the same appointment as a vehicle set, by the same certified applicator.
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