Totally agree with Bunyip.
Get any caravan / camper trailer manufacturer to build as many units as Jayco do and see if there's are perfect. I highly doubt it, not unless you wanted to wait two years for it to be built and pay 5 times the cost of a new Jayco.
It's like comparing a Holden or Ford to a Ferrari. If Ferrari were to build as many cars as Holden and Ford do for the same cost in the same time frame then I bet there build quality would come down too.