I made this same choice last fall.
I purchased the loaded 855s total weight was 3200 pounds wet with AC and Solar panels.
The only Truck in Diesel that would carry that load within the GVWR and leave room for me and my wife with gear was a Chevy 3500 HD crew cab short bed. GVWR 11,500 pounds total payload was 4,264 pounds with a rear axel max of 7,500 pounds. It only is available with a 3.73 rear end. I put a set of Air Lift - Load Lifter 5000 ultimate's on just for stability and to control lean. I have driven in on the highway and into camp grounds and it is like driving the truck with nothing on the back. The set up is sweet and my truck is NOT OVER LOADED, like about 99% of the set ups I read on here.
PS: Tires were stock Load Range E rated to over 4,000 pounds each.
Look at the post on a 1052 on a SWD 3500. That rig weighed over 6,000 pounds wet - how can any truck haul that and be under the GVWR? It would tax a Dually. I would rather be safe then dead with a big camper.