Pressures can go higher. In fact, they do every time you drive the truck. The heat generated by running
down the road on even a 70-degree day probably raises the pressure of the air inside your tires by 10 to 15
psi. And on a hot day, with a heavy load at interstate speeds, it could easily be more than that. Let’s say
that again: Running at highway speeds adds at least 10 to 15 to 20 psi or more to your tire pressures
– temporarily.