F150 and Reflection 150 series?

I didn't see this mentioned but some rv trailer owners don't increase the rear P tires pressure on the truck to max psi (44 or 51 psi) when towing/carrying a load. They use what the door post tire placard tells them which is generally around 35 psi. Granted there is no load capacity gain above 35 psi on a P tire in a truck or trailer application but going to max psi stiffens the sidewalls and helps eliminating sway issues. Just a thought.