As just about all of us have read here, certain models of WW trailers have defects that have resulted in a number of different problems. To one degree or another, this subject has come up on this for...
So far so good on my FS2600 frame. My brother has a 2005 FS3000, his is ok to. We have the smooth sides and mine has a small slide out. Maybe they're not effected, I don't know. My frame is like 6" C channel though.