Buying a known (?) problem

Well, a lot of people on this forum will think we're crazy - but we decided to bid on the Gulf Stream. The infrared thermometer clearly defined an area of delamination on the (fiberglass-walled) Holiday Rambler Savoy we liked (but now will avoid); but it didn't work so well with the Gulf Stream. We rapped on the walls everywhere - the only spot that's soft is the one we knew about from the start. I've watched all the videos on repairing rotted walls/ceilings/floors - and it doesn't look too scary (at least "wood" is the construction material I know the best....LOL!)

I'll know Wednesday night if the GS's owner is willing to take a financial beating ;-) Because that's the only way we'd buy it.