My lowly entry-level Ram 2500 w/5.7 Hemi, 3.73 gears, and 5 speed tranny had no problem towing our loaded 8,250 lb. TT (TV & TT = 15,000 GCVW) throughout the Smoky Mts. last summer. My engine/tranny temps barely increased after spending hours in the mountains in 80 degree temps...
For a number of years I towed loaded construction trailers, flatbeds, etc. behind a variety of 1/2, 3/4, & 1 ton trucks. IMO my Ram 2500 could handle 17,000 GCVW more safely than the F150 EB that is rated @ 17,000 even though my sticker is only 15,000... I think marketing departments play with the GCVW, payload, etc. numbers depending on what else they have rolling off the line at the time & what other manufacturers are doing.
For example, regarding the lesser Ram 1500, PickupTruck.com noted in 2009,
Quote:
Ram's maximum towing capacity has been bumped from 9,100 pounds to 10,450 without any apparent hardware changes.
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Later, in 2012, the only change for the stock 2500 was a slightly improved torque converter and a change in the electronic shift sequence so their 5 speed tranny uses gears 2 & 3 in succession vs. choosing one or the other based on acceleration & load. Because of this, it is now referred to as a 6-speed even though it uses the same parts w/different shift pattern...
Although Ram's stock trannies are not the best in the market, I'm sure my tranny is capable of handling a GCVW of 17,000. So far I've always hit the CAT scales at just below GCVW but should we go slightly over, I still feel safe... In comparison, I have towed with 1/2 ton trucks well under GCVW & did NOT feel safe. The soft rear-end felt very squirrely to me & I was glad to snag a 3/4 or 1 ton from the boss the next time I needed to haul the same load...