We have a 2002 2980 and have loved it since we bought it two years ago from a dealer. This summer we noticed a soft spot it the floor. Upon removing the flooring we have rotten floor joists too. I have had two places look at it and tell me the roof is rotten ($4800-8200 to repair), down the back wall and under the floor soaking the insulation. This had a wicking effect to ruin the floor. The part that is so surprising is that there is no visible damage other than the floor inside. I was and am surprised that a unit this new would be so sick.
I am writing as an both an encouragement to CAREFULLY inspect your roof as well as fishing for any ideas for assistance. I did try my insurance company, they found it to be a maintenance, or lack therof, issue.