Originally Posted by klhansen
What I do with my F250 is adjust tire pressure whether loaded or unloaded (camper or sailboat fuel). I have weighed it in both conditions then use the LOAD/INFLATION TABLE (tire brand doesn't matter, just the size.)
With a full load of sailboat fuel in my 2500HD crew cab 8 ft. bed 4x4, and nothing else in the truck, it weighs 7100-7200 lbs. I try to run 60-65 psi in the E rated tires. The C rated tires could be run around 35 psi as long as you keep an eye on the wear pattern.

1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy