[JRTJH]

If you look at your tire sidewall, it will say something like: "MAX COLD INFLATION PRESSURE 65PSI"

Trust me when I say that every (EVERY) tire engineer at every (ALL OF THEM) tire manufacturer knows that "heat expands".... They all have "designed into the tire" the ability (and the expectation) that the tire pressure will rise when the tire is in use. That pressure increase is FULLY EXPECTED and is FULLY ENGINEERED into the tire.

You should NOT decrease any pressure, simply set the COLD inflation pressure per the recommendation on the trailer tire pressure decal (located on the roadside forward sidewall of the trailer. That recommended pressure will likely be the tire "maximum COLD inflation pressure" which is 65PSI. Then, fully expect that the inflation pressure will rise as the tire "heats up to operating temperature"....

Essentially, what you're looking for on the TPMS is a "dramatic difference" in one tire.... If you see that, it's time to inspect for reasons why it's different. If they all "go up together, go down together and stay about the same" then you've got nothing to worry about except staying between the white lines and under the speed limit !!!!!