Hey Jay, welcome to the forum! Sounds like you got a pile of work ahead of you with this one. Prowler was a Fleetwood brand in 2006, so it's made just like my 2008 Terry was. I found a pic of a frame that is just like what Fleetwood used in that era:
On top of the frame the floor platform is built with 2x3 framing and 1/2" flakeboard, and extends all the way out to the outriggers. Picture a floor platform running on top of the whole frame and out to the ends of the outriggers.
Once the floor platform is framed, they roll out the sheet vinyl, add the base cabinets, then attach the walls on top of the floor platform (just like a house) and screw the walls to the cabinets.
If the floor is that bad, then the baseplate of the wall is probably bad too, and the wall is sinking down between the steel outriggers. Unless those are rusted off, in which case there is nothing but the cabinets holding that wall up.
Hopefully the vinyl floor prevented the cabinets from soaking up that much water, so if you can save the cabinets you'll be money ahead. Get the cabinets and appliances out of there ASAP, Then tear what's left down to the frame and start with a fresh floor and build up like they do at the factory. Big project but do-able if you have the time.
