It will certainly be a big job...insurance companies totaled out a number of Sunlines last year when there was so much flooding in/around PA.
It wouldn't be too bad of a job if you had a way of lifting the body off completely. That could consist of a way to put two stringers across/underneath the walls and then four bottle jacks to lift the walls off the floor. Then you could roll the frame out and completely redo the floor then. You would also need a way to remove the slide before doing that too.
Remember, it will probably require pulling some aluminum off the outside (on the bottom) so you can remove all the screws holding the walls down and then pull the screws out that hold the cabinets down. It would be a big job.
2007 T-286SR Cherry/Granola, #6236, original owner, current mileage: 9467.8 (as of 5/26/19)
1997 T-2653 Blue Denim, #5471
1979 12 1/2' MC, Beige & Avocado, #4639
Past Sunlines: '97 T-2653 #5089, '94 T-2251, '86 T-1550, '94 T-2363, '98 T-270SR