You still have not understood my point. The 2500 is designed for the 10k limit. the frame, engine one tranny etc are the same as the heavier 3500 series. BUT by design the coil springs are spece'ed to be ideal for the 10K weight. and unless you want to modify, ignore, or overload, they are what causes the limit to be at that point on the truck as built.
Yes I have a 2500 but 2wd, mine is near 3000 lbs because of the gas engine I have towed tt's and had a TC for a while. But I dont tend to jump in and out of my trucks frequently so I Have not had a need as of yet for a diesel.