If your plan is to gut the thing to repair serious floor issues, be sure to store the furnishings and appliances for re-use. Then with updated floors, window treatments and such, you can have an original but improved look.
I found in my trailers, the floor damage was not very severe. In one I used wood putty and bondo to repair some areas that were lightly water damaged. I cut out the plywood in another, taking away just the area that was damaged and adding in a new scabbed section of plywood. Wood hardener around it and then a sealer over the whole floor to finish it off. With new cork flooring over the subfloor. all was well.
Be creative. You don't have to break the bank on every repair. I like this idea used to replace damaged or missing cabinetry. Sure looks great too...creative and probably not a huge investment
a 1940s waterfall style dresser in a 50s Airstream