Trucks a generally "rated" by cargo capacity, meaning a 1/2 ton truck like a Ford F150 or Chevy 1500 can carry 1000 pounds. Here's a general description from an online truck reference...

Full-size pickups in North America are sold in three size ranges - ½ Ton, ¾ Ton and 1 Ton. These size ranges originally indicated the maximum payload of the vehicle, however modern pickups can typically carry far more than that. For example, the 2006 model Ford F-150 (a "½ Ton" pickup) has a payload of between 1,400 lb and 3,060 lb, depending on configuration. Likewise, the 2006 model F-350 (a "1 Ton" pickup) has a payload of between 4,000 lb and 5,800 lb depending on configuration.
Towing capacity is typically a separate rating and has more to do with how the driveline, brakes and tow hitch are optioned out. My F-250 had the V10 and tow package which rated it for 15K towing. If I had gone with the diesel it would've been 17,500 pounds, but at the time the $4500 premium for the diesel versus $500 for the V10 didn't warrant the expense. Filling up that 38 gallon tank now would probably bring me to tears!

The CUCV we got is rated as a 5/4, or 1 1/4, ton suspension which is pretty stout. The M1028 though is a special version designed to carry a slide-in communication/command shelter so is rated for an additional 1000 pounds on top of that. These are seriously tough trucks, but very utilitarian. I'm not sure yet if I'm going to keep it military or make it a bit more civilized. A lot depends on how much I''m going to drive it I guess. We still have several diesel Mercedes I'm tinkering with, and I need to start working on the mold for the one-piece VX nose for the rally truck which means driving something other than the VX. If that's going to be this truck rather than a Mercedes then I'll need to put at least a radio and maybe A/C in it.

We'll see!