I live just outside Nappanee, IN (Omish meca!), and most of my family members, including myself at times, work in the trailer/RV industry (Elkhart & Nappanee). I will say that 80% of the companies are seedy, sort cutting, conniving, half as*'rs that should be put out of business. Luckily, the recent downturn in the economy took care of some of them. There are very few companies that take any real pride in there product, and even fewer that want to hear from anyone that might not be satisfied with the product. The guys & gals putting these together are paid on piece rate. A large percentage of them are cranked up on meth among other things, to keep up with the grueling pace of production. The companies are concerned very little with quality, it's all about how many they can get out the door in a day. Parts falling off (sides, roofs, axles, wheels, molding, decals, windows) in transit to the dealerships is a very common occurrence. Once the product arrives at the dealerships, it is also common for there to be a page (8 1/2" x 11" handwritten) or more of issues wrong with the unit that the dealer notes upon receiving. So a little more double stick tape, caulk, and wood putty are added so that the dealer can keep the "repair" credit from the mfg, without "really" spending any of that extra margin they have just created. Then you arrive at the "dealership" with your hard earned money, and a quest for a nice new trailer, completely unsuspecting that your about to get screwed from so many angles that you don't know where it all went wrong. Hard to say that you ever stood a chance.
With that insight into the industry itself, I will say that there are a few mfg's that are better than most. They are in no way exempt form the above mentioned issues, but at least put forth a bit more effort in trying to make a decent product (in my opinion).
Haulmark
Atlas
HartLand RV's
Travel Supreme (now out of business)