I would suggest that you head over to Rv.net and ask your question on the TCer page.
You will find that these are a loved model and they do stand up well but there are a number of things to look into before buying. Check EVERY cupboard and drawer with a flash light for any type of water stain or mold. Check the roof openings for signs of leaks.
If it has been looked after you should be fine, if not..........