Try this find a level place to drive with no crowning where you can drive straight. Air up your tires to 44psi. Buy some kids sidewalk chalk and chalk your tire treads all the way around. Drive the truck straight and check how the chalk has worn off the tread. At 44psi it will most likely wear off in the middle. Lower the pressure 1 psi and repeat until the chalk wears off evenly. That’s your magic psi for your vehicle.