I had some serious problems with my 2011 Jayco 31FS but I researched the products within an inch of their lives before I dropped the bomb. My Jayco had serious wiring issues but Jayco finally flew a technician from Ohio to Florida and he rewired the entire coach. It has been problem free ever since. The reason I bought Jayco is that the quality is there in every part. Thor has a 1 year warranty where Jayco has a 2 year warranty. The cabinets are warranted for life.
Some add-on suggestions you can have the dealer "Throw them in." tell them that you are thinking about a Thor and you want Slide out awnings and Max Air Vent Covers. They will hem and haw but they will add them. When in the finance office purchase the 5 year extended warranty it is worth every penny! Happy motoring!
OBTW Don't fret about the horrible gas mileage at the start. As the motor breaks in it will get better.