I guess I meant the dinette chairs.
The bad thing is that the slide is made like a box, all of the sides are welded together. The walls are most likely built on top of the floor, so repairing it from underneath might be the most obvious way to go. Unfortunately, that would mean removing the slide.
I suppose the floor could be opened up from the top, and extra bracing put in place. Just not sure how one would attach the bracing to the outside wall. But if it could be done, an extra layer of tongue-and-groove plywood could be put down, then new carpet.
Anything is possible for someone handy with tools, but you never know what the solution is until you open up the patient!
Good luck, and please let us know what you find.