We just went from the 2500 5.7 gasser to the 3500 6.7 big horn set up.
We love it. But we would say all depends on how much you want to pull. We plan on maybe upgrading again and wanted the extra.
Our current fifth wheel is a 40' 12,000# bunk house. But we would like to look into a toy hauler so we went with the bigger rig.
We haven't towed with it yet. Only have had it 2 weeks.
But we like it and haven't noticed a change in the ride. Only thing we did notice a difference in so far is turning radius as we went from a mega cab to a crew cab.