When I visited the factory last April, every unit was "gone over" by a crew before it left the line. Trailers are on a roller as they go down the production line so a level would be of no use. Templates are used extensively as the unit comes together. If you take the 100,000's of thousands of units they produce yearly, the quality issues are not that great. We had nothing of any consequences on our unit, and lived in it for 5 months right out of the factory. Every component worked properly, never had to return to the dealer (not that we could) for anything. Did have one small issue with the radio connecting to the TV and they sent us a new radio with no questions asked. I installed it myself. I see lots of Jayco's working at campgrounds and almost always get an I love mine from their owners.
Anyone can have issues and in a perfect world they would never happen, but to me, it's more important what they do after the sale that counts. As far as comparing them to a car dealership, it's a total different animal. A car dealer is a franchise, an RV dealership is not a franchise and most handle a number of different brands. The factory has no control over the dealership, and a dealership has no obligation to perform warranty work on any unit.
I purchased from RV Express in Middlebury Indiana. They did a good PDI as did I. If I had an issue I could not take care of and my local dealer didn't want to take care of it, I saved enough that I would just hire a local company to deal with it.
In my opinion for the money Jayco produces a good product at a fair price. I'm a happy camper...literally