puny what?Payload is determined by subtracting your trucks weight from the GVWR. Our trucks have a GVWR of (I had to look these numbers up for you):
Hopefully that will help you out a bit.
Basically, 1/2 tons will have like a 5/6 lug pattern and 3/4-1tons will have about 7/8 lugs plus bigger everything else, like control arms, wider track, bigger frame, bigger ring and pinion, etc. etc.
The thing that's really holding our trucks back from being a 3/4 ton are the puny (no offense guys, it does flex quite a bit and while it's good for returning back to it's original shape a 3/4 ton or a 1 ton is EASILY a lot beefier:dry, and of course the GVWR. It's simply not high enough.