Which 1 Ton SRW Diesel Truck Has Highest Payload???

Payload is a hard number to figure out. Payload can be different between two same model trucks sitting side by side. Payload is determined by the difference between GVWR and curb weight of the truck. Options of the truck will determine payload. Diesel vs gas engine has a big effect on payload due to the extra weight of a Diesel engine. Fuel tank size, etc. best way to find a good high payload is to look at the door stickers of tow vehicles that have the options you want and compare.
Bill