It used to be, until very recently such as in the Dodge options, that most SRW 3/4 and 1 ton trucks shared the same frame, axles, engines, brakes, etc. The only difference being the added leaf springs, blocks, and higher capacity tires. For the most part, it is the tires that limit the RAWR of most trucks, as all other structural parts are equal. You can "unofficially" equalize the difference with higher capacity tires to increase your RAWR, springs and/or air bags. This is also why there is not a big price difference between the two trucks, as structurally, they are basically the same. The real difference comes with the duallies, as obviously you get more stability and much more weight capacity with four tires vs two.
