ram1500 5.7hemi

I would never recommend to overinflate. Set it to the max cold psi on the sidewall or slightly below. For example my door placard says 36 psi cold but the tire sidewall says I can go to 44psi cold. I set mine at 40 but I'm going to try 42 next trip. I usually go to 38 on the front. If you notice, your sidewall says something like 2679lb max load at 44psi cold. If the pressure is lower then you cannot achieve the load rating stated on the tire.

edit: when not towing I'm at 36 psi to save the center of my tires.