Regarding porpoising:
With my Chevy 1500HD Crew Cab 6.5 foot bed I had a little porpoising.
With my GMC 2500HD Crew Cab 8 foot bed I do not.
The Chevy is 20 feet long. The GMC is 22 feet long. I am not sure what the wheelbase is, but the GMC is certainly longer.
My point is, it has been my experience that longer is better, at least in regard to porpoising.
You probably do not want trucks as big as I do. But if I were comparing two different tow vehicles, wheel base might become the tie breaker.
I do not use WD hitch or sway bars, because they are not necessary for me.
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