Originally Posted By: SteveSRT8
Our current RV weighs just under 13k pounds and is set up as a fifth wheel with about 4500 pounds on the tongue.
I can assure you after hauling it all over this country in all kinds of weather, up and down mountains, and on paved and unpaved roads I have NEVER felt a need for dual rear wheels. Snowstorms, thunderstorms, mountain winds, etc.
If you hitch to your bumper the difference is huge, but with a long wheelbase 2500HD Dmax and a fifth wheel setup you will not need anything more.
Yeah, I was speaking more from a bumper-pull perspective.