I have AT's and run 50 when hauling wood. otherwise about 35-40.
They're load range D and rated to 65.
Higher pressures reduce sidewall squat.

don't exceed the max psi printed on the sidewall.

 

This is true, but it really depends on how much the load weighs as to how much pressure should be in the tires. Also, you should only pump the rears up that high. The weight on the front doesn't change much when you're carrying a load.

There is a specific psi (technically a small range of psi) you should run in a tire. The tire is supposed to have a particular footprint for even treadware and proper distribution of weight. That footprint is measured in square inches. The weight of the truck is measured in pounds... thus you get pounds per square inch. If you are running too high a psi for the weight of your truck, you will have too small of a footprint to compensate and wear the inner tread of the tire. If you are running too few psi for the weight of the truck, you will have too large of a footprint to compensate and wear the outer tread of the tire too fast. Its all about keeping a balance of weight of the truck and contact area of the tire. So yes, you should increase the pressure if you are carrying a load and decrease it when you empty that load, but it all depends on how much weight you add.

The factory already calibrated the pressure for a stock weight truck with stock tires. If you've made your truck heavier, add pressure to the tires, if you've made your truck lighter, subtract pressure from the tires. If you've gone to a bigger diameter and/or wider tire, subtract pressure from what the door jamb says, if you've gone to a smaller tire, add pressure.

 

I run my tires at 42, look at your tire and leave it at a pressure that has the tire tread even across you can use chalk and draw a line and drive over it and see were its rubbing of and staying.

If the middle of the chalk is gone but the outside is there lower pressure if its the opposite add more air

 

yes it is smart as i am a concrete mason and i haul alot of block
and as far as tires go.....these 35" procomp X-terrains have 45,000 miles on them and still have 5-6/32's on them. they wear perfectly and do not cup or anything, i rotate them every other oil change or so

 

Ok, I stand corrected but people like you annoy the crap out of me. Just because you have a job that requires you to carry heavy loads so you need the pressure does not mean you should give that out as advise for someone who probably is not in the same situation. If he actually listens to you and puts 50 psi in his tires and doesn't carry a heavy load, you just cost him a perfectly good set of tires that will wear prematurely. Think before you give advise.

 

I'm gonna have to agree with that Dakota guy even though he's lurking in the Ram section.

 

Lol! The trucks are more similar than you may think and the gen 1 dak section has been slow in the last couple days.