WAGM - I know I am not completely understanding your explanation. You took the cushions off the frame - that I understood. Don't know how easy that will be on the 211? Then you took apart the cushions and inserted additional foam? Or you merely added plywood to the frame and covered it with added foam? Could you explain that part a little slower?
We also are having a slight problem with comfort riding on the couch while traveling. I think our springs (on the Chevy chassis) are a little too stiff, the couch tends to jolt you when the wheels hit "tar strips" on the highway.
Gene
B Plus 211-S w/5.7 Chevy