Buyers complaining about Ultra-Lite floor. What to do?

I know what your talking about. I bought a new ultralight in 2003 and it had the same issues from day one a sponge floor. I traded it in after one trip. Trading it in might be your best bet. The only other thing you can do is add more reinforcement to the floor supports. Either way you'll take a loss. You might get lucky with someone that has knowledge of foam core floors and be able to sell at a discount.