What do you think is the top payload rating among new one-ton trucks? All the advertising goes toward horsepower/torque and towing capacity, but what configuration is king of payload?
For the most actual payload looks like a GM reg cab long bed 3500 DRW 6.6 diesel with those big 10500 rawr numbers are running in the 7500 lb in the bed payload.
The same GM 3500 DRW with the 6.6 gazzer gets 7630 lb in the bed payload. These numbers come from GM weight calculator on their ordering guide website.
Ford is close with 9900 rawr and Ram has 9720 rawr.
I'd have no idea what the vehicle mfg payload stickers will say.