Jeff,
Your 1972 1/2 ton could have a GVW of 4700 pounds (Standard truck w/o power brakes and 4 ply tires) up to 5400 pounds (Standard truck w/ power brakes, 6 ply tires and HD springs).
The truck curb weight is about 3800 pounds (V8 w/ 8' bed), so you can legally carry between 900 and 1600 pounds depending on how it's equipped.
Mike B
