If you have the choice, get a 3500 SRW for the overload springs. You'll still need additional suspension help with heavier campers with either a 2500 or 3500. Think air bags.
I haul my AF 860 which is basically a 811 with an older model designation. It's not light, but my 2500 srw truck with airbags does fine. I need to do a little more work to get it to load up the rear leaf springs after I air up, so it rolls a little more than I'd like, but nothing terrible. I've driven it up the Alcan Highway and all over AK this summer, not the best roads and it was never scary.
Plan on better than OE tires. You can get E load tires close to 4klb capacity vs the OE types that are 3k-3100lb cap.
Camper wise I have little experience other than my 05 AF 860 which ahs been flawless so far. It was pretty well taken care of, but was not owned by someone who was a do it yourselfer and he had no complaints or unexpected repairs. I think they are one of the more luxurious models of TC's. Full side slide out vs jsut the dining table slide makes for more room. Huge (by TC standards) 3 way fridge. We can easily fit 3-4 days of food for a family of 4, eating well with enough room to rotate a good selection of drinks. Haven't packed a cooler yet! Quality cabinets and fixtures, well though floorplan and use of storage. I'd reccomend the AF highly.