Thor built rigs will have a sticker at the driver's left sidewall with on and off assembly line dates. The Ford incomplete vehicle stick has the chassis dates.
Personally I wouldn't worry about it. My 2006 was thrown together in the middle of the housing bobble when everyone was flush with cash thru refinancing their homes and buying flashy toys and my build dates seem to confirmation of my speculation. April chassis build completed and the coach leaves the Four Winds factory in June two moths later. Even being a repo my rig has been pretty easy to maintain and has never had me headed home early. My one break down I fixed the next day in the driveway.
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