This is what you have to do. I max the air pressure when towing. I run 10 plys on a Grand Cherokee. BFG KO 2 . Daily the tires are at 40psi. I had Mich AT2 on my Cammander, 45/50 psi daily and 65psi with a trailer. Some where in the 50’s psi would probably be good for your 1/2 ton. My 3/4 ton over loaded work truck,80psi rear,65 psi front. The weight of the vehicle and the load you have in it will determine the pressure to run. Off roading the GC,I air down to 18psi.