The RV industry just went through a giant bust period, and a lot of the best people in the trade either starved to death of found another line of work. Example: the excellent repair center Coachmen had in Fitzgerald, Georgia is now a school bus barn.
As the bust cycle turned to boom, the new people coming into the RV production line are new, and probably marginally qualified for the job, and just hungry for the paycheck.
The dealerships pay lip-service to the QA issues because, hey, warranty work is a slice of the pie.
Buy used and let some other poor guy eat the break-in issues and depreciation.