I never adjust pressure on trips in the Rockies.
It may be 100 degrees here when we leave for NM/CO/WY trip with tires at 80 psi cold set on the trailer.
At each stop I do a visual and use my old thumper checking for a low tire but never adjusted a tires pressure. Simply not needed just because of elevation.
Sure a tire may not be 80 psi up high where its much cooler but no longer than we drive at interstate speeds up high on I-70 thru Ike's tunnel or on a twisty winding narrow state hiway in the mountains , the tires will be fine.
