I just bought a 2011 funfinder 189fbs. First purchase of travel trailer. Has a small slide out about a foot or so. looking underneath slide out (extended) has a center rail and two slide rollers each ...
I'd be heading back to wherever you bought it (if at a RV dealer) and looking either to cancel the sale, or get the problem fixed. It doesn't sound good because you're bound to have a big problem if the bottom of the slide is beginning to fail. I'm thinking that the whole bottom panel of the slideout may need replacing which sounds like a very expensive job. I hate to have to say that but that's what it sounds like to me.