Doesn't matter really, whatever the door says is what you should use. Tire pressure is based on vehicle weight, not the tire. Most tires can handle 60+ psi, but no one is about to crank it up that high.
99 Chevy Silverado Z71 6" rough country lift/W 35" tires, 4.10 gears, (4.56 soon) S&B CAI and a flowmaster super 44 exhaust.
"Never argue with a fool, they will lower you to their level and beat you with experience." My personal motto.