Maybe there aren't that many people on this forum who have the Rockwood 5th wheel's. The 8280 is probably built much like the 8' wide travel trailers. My 8315SS has Alko-Kober rubber torsion suspension on a steel I beam frame. Brakes are 10", wheels 15". The walls are laminated construction with an aluminum perimeter frame (meaning minimal vertical "studs").
I looked at the 8280, like the rear kitchen arrangement, but it has very limited wardrobe space for hang up clothes.
Good luck in your shopping adventure.