Pursuant to the above post, IMO best way to not get a "lemon" or at very least have to put up with multiple warranty fixes, buy newer used, private party, where you can get the repair history from the original owner. Preferably older person who is meticulous. (You can tell when you talk to someone )
Most "problems" are assembly quality issues or stuff that pops up when the rv is new. Again, IMO. Have friends and family that have bought quite a few new RVs. Seems most of the issues are first year/uses.
Wouldn't deter me from buying new though. Look at fit n finish. If everything works and it looks good then it'll be ok.