We looked at an ideal- interesting, but the back was like a cave with restricted headroom. We waited for the RS on the 3500 chassis. When you subtract the unloaded vehicle weight from the gross vehicle rating, the ideal can carry about 750 lbs of people and cargo (not very comforting for me) while our RS can carry about 2880 lbs.
I admit the SS would be easier to drive in tight quarters, but the extra capacity and space of the RS makes it better for us for its intended purpose as a camper.
Bob