Ditto what Steve said.
However, the OP is looking for manufacturers warranty, which he won't find on a pre '07 coach. He would be better served to look for a quality luxury coach, Monaco, Newell, Country Coach, etc. and get an extended warranty to cover the things he can't fix himself.
For instance, Monaco made three, now four LUXURY coaches prior to '07. The Signature, Executive (now discontinued) the Dynasty and the Camelot, in that order. The difference between the coaches mainly consists of options. The Sig was fully optioned, the Exec slightly less optioned and on down the line. They ALL have a STEEL structure. The coaches below the luxury line had a composite aluminum structure.
All luxury coaches have solid wood interiors, better fit and finish, upgraded fixtures, screws instead of staples, etc. etc......just my opinion.....Dennis