Tire pressure when traveling

OP wrote:
I have the Tire pressure monitoring system < my tires are load range E and inflated to 80 PSI which is what is called for on the tires, when I am traveling they heat up to where the tire pressure is over 90 psi and that is with outside Temperature is in the 60 to 70 degree range, going south in November, I get concerned that the pressure is way to high, Opinion,s

I may be missing something here, but what are you driving? What size tires do you have? If you're driving a MH, 80psi cold seems low, and if it is too low for your weight, that could be why you get so much heat expansion.