Identical to what happened to my son with his 2008 Rockwood ultra light. People rightfully so instantly think water damage as they well should. It's an RV!!!!!
His started in front of the sink area and spread to toward the door which is the main travel path of course. He started out around $8500 iirc which I figured was top dollar. As he got tired of showing it to people he kept dropping the price. After a month or so he ended up getting $5800 from a guy who was going to live in it and needed one NOW.
He had one guy interested around $7200 but his wife wouldn't go for it and was stuck on water damage. The guy who bought it had his mother with him and she had snowbird experience so she understood what we were telling her. It's from the foam sandwich deteriorating not water. My son wanted to buy a FW so we were busy looking but 90% of what we looked at WAS water damaged. I didn't have time to try to fix it.
Sorry I cant offer much but good luck to you. Maybe you can say that it has a soft floor from foam deterioration and for people to search the issue on the web. It socks but just keep dropping the price or wait for the person who will deal with it. Everything sells, it's just a matter of price.
