May well be that RV's are getting "cheaper" certainly not in price but seemingly so in construction. A friend has a 1999 Designer fiver and it's one tough and pretty rig. I consider our 2003 Class C marginal at best. Jayco was big on this forum in the early 2000's and it seems to me the luster has faded on the brand.
Like several others above, I've contacted Jayco several times and they've responded to my questions promptly. Ving Tranh or name sounding like that.
Saw a video where Jayco built a TT in one day's work. I don't think they build one at a time start to finish, but video showed it can be done. I doubt other builders are much, if any, different.
My understanding (subject to change based on others' understanding) is the workers are paid a "day's wage" and can go home once they reach a certain point in the construction of a certain group of RV's. If it's true, I don't think it's a work ethic that promotes care and quality.