Tire pressure before going south

I use a tire monitor system for my fifth wheel and my truck has one from the factory. I have traveled a lot this last spring, summer and fall. I have gone from 40 degrees temps to 117 degree temps. Mountain range in the east and west. Did 14K miles and 26 states this summer. I keep my tires at or very near max cold pressure regardless of the outside temps. My fiver has 125PSI tires and my truck 65 and 80 PSI rear. I monitor the pressure with my gauges while driving which is pressure and temp on the trailer. Your pressure will rise and the tires will heat up. If they are at or near max in cold weather they will not diminish when driving and they will heat up as you drive. Maintain the recommended cold pressure regardless of the outside temp and you will be fine. Check you pressure manually at least once a week with a good quality gauge. It is not uncommon for tires on aluminum rims to lose a few pounds of pressure over a month or so.