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I have a 1995 F-150 and am running 32x11.50x15 BFGoodrich All Terrains. I'm running 35 psi in them right now but they look a little low. I always ran 35 psi in the 31x10.50x15 BFG ATs that I had two sets of before. Should I be running more than I am? What would be the proper tire pressure?:-)
The only correct answer is that you need to figure it out. Many factors contribute to the correct tire pressure for your application, including truck weight.
Take something, like a stick of chalk, an mark across the tread real well in one spot. Drive a few feet until the tire has made one or two revolutions. Look at tread. At the correct tire pressure, the chalk on tread should wear off evenly across tread. This will give you the best tread wear over the life of your tires.