2008 r vision wall sinking

For that to happen in a 2008 R Vision you have to have a failing floor assembly and / or broken outriggers. The outriggers support the floor and more importantly edge. The floor is a laminated assembly of two layers of thin plywood with foam and a square aluminum tube frame between them, glued and pressed together into a sandwich. It has a continuous piece of this aluminum tube at the edge along the sides of the floor assembly, on top the ends of the outriggers. The wall sits on top of this and is bolted down through the floor assembly through the outrigger. The wall is the same type of laminated construction.