your downfall is just the engine itself. The axles frame and brakes are not any different than the diesel truck.
I run my 3/4 ton REALLY close to GCVW & have no problems towing through WV, VA & TN. The ONLY difference between my 2011 Ram 2500 CC ST with a GCVW of 15,000 & a 2012 w/GCVW of 17,000 is that the newer ones have a 6 speed tranny vs. my 5 speed. In 90 degree heat in the mountains my tranny temps never rose, so I'm not worried. Just like in the above quote, the rest of the truck uses the same springs, engine, axles, frame, etc. to tow 1 ton more...
When driving 1/2, 3/4 & 1 ton trucks commercially, the 3/4 & 1 tons could all handle running a little overloaded without issues. In comparison, the 1/2 tons would burn through brakes, springs, etc. - even when we didn't push 'em...
IMO the Equalizer 4 is the best bang-for-buck WDH. Our dealer was having a big sale when we bought our TT so they didn't budge on price much but they included the Equalizer 4/installation, pressure test & re-caulk, 2.5 hour PDI, & some store credit within our purchase price.