If you are talking about a triple slide Host, FORGET any ideas about a single rear wheel truck!!! Those things are even pushing the envelope for dual rear wheel one-tons.
I'll echo what most people who have had multiple truck/camper combos say: SRW, not good with big camper. Less stable, rear tires overloaded. DRW, much much much better.
If anything I'd say the dually will be BETTER on iffy roads while carrying a camper. Stability helps a lot when you're way off level. Size doesn't affect anything here because the camper itself is as wide as the DRW truck anyway, you gain nothing with a SRW.