My 06 FKTG had the floor in the bed room rotting on the edges. Of course the edges are where the walls fasten. I replaced it by myself. I did a write up on the NUWA owners forum. Once water gains a entry point the chip board starts soaking it up at any point where the wood has been cut or a hole drilled. It soaks in then along come old man winter to freeze it and make it expand so next thaw and rain it can soak up more water. It doesn't take to many cycles to do a lot of damage.
The bedroom slide was a simple job. Those 14' slides might be another matter. Guess I better check mine a little closer.