We always used to check TV and trailer tire pressure before moving to a new location but eventually got a TPMS. In the five years we've had it, the system has picked up two separate occurrences of slow leakage that developed after being mobile. One was a nail and the other a screw. Both times I installed the spare before the tire deflated enough to be noticeable. I still check pressure before departure, but from the cab of the truck.
Dave
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