fwiw, mostly on the subject of longer wheelbase is better...
I have two trucks that are very similar:
2002 Silverado 1500HD crew cab with 6.5 foot bed 4 speed automatic
2009 Sierra 2500HD crew cab with 8 foot bed 6 speed automatic
both are 6.0 gas 4x4
When towing a 4,100 pound TM 2720 I can tell the difference, because the rig "porpoises" less with the Sierra. I attribute that to two things, stiffer suspension and longer wheelbase.
For the Silverado I use a Prodigy knock off add on brake controller. The Sierra has the factory integrated brake controller. Much smoother operation. Less bumping and grinding. Much more responsive.
I also like my Sierra over the Silverado because it has the factory towing mirrors instead of the McKesh strap on mirrors.
Both get the same fuel economy (or lack thereof).
Both trucks are bigger than they need to be. I like it that way. But my budget is not your budget.
The Silverado became my daily driver when my beater Sentra died last summer. I have logged 7,600 miles on the Sierra since August 2008, when we bought it.
For sake of completeness, I would never have tried towing my Trailmanor with the 97 Dodge Dakota I had until recently.
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