[madweazl]

On cooler days (ambient temp), our tires are typically 6-8psi below a "normal" ambient temp day; call that a 45 degree night vs a 75 degree day. I've also observed a similar pressure difference from the tires on the side of the trailer that are in direct sun light vs the shaded side. Once I've driven a few miles the pressures balance back out again. From stationary to driving at highway speeds, I usually see a 6-8psi increase as well. With that in mind, if my trailer tires start at 74psi and can be reasonably sure they're going to hit 82psi on the highway. At 80psi cold I'll usually see them at 86-88psi on the highway (think I've seen as high as 93).