On my '14 Tundra/Hawk rig I'm running 70 psi rear, 60 psi front on E rated tires. My Firestone Ride Rites are at 30 psi. My local tire pro says running at 40 lbs with a load will overheat the tires. On a recent trip total weight for my Tundra, Hawk, supplies, and myself was 7920 lbs.
Rando...