fwiw,
I have towed my 2720 behind my 1500HD with the 6.5 foot bed and also with my 2500HD with the 8 foot bed. Both crew cabs. No WD hitch.
I can tell you that the bigger truck does substantially less porpoising (flexing vertically at the hitch on bump roads.
I attribute this to two things:
1. longer wheelbase
2. stiffer suspension
I am not trying to suggest that everyone should get a truck. I just want to point out my personal experience regarding what you MAY gain by using wheelbase or rear suspension capacity as a tie breaker when choosing a TV.
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