Cs apparently are built so they max out the rear gross weight rating before you put anything in them! So adding weight towards the rear is a big issue. (towing with much of a hitch weight can make this worse of course.)
Ours has air bags to keep it level, but that does nothing for the weight on the back tires. I just pretend this is not happening and keep the back tires at a higher pressure. That makes them happy but we are still over the gross rating for the back.
A 24 might be better for that than our 28 with the overhang behind the rear axle. There is a ratio thing for the overhang wrt the wheel base.