You can not purchase a Forest River. You can purchase a Coachmen, a Rockwood, a Salem, a Palomino, etc X 50.
Those different brands for the most part operate independently like separate companies and some are good, some garbage.
So comparing Jayco to "Forest River" makes no sense. You would have to compare Forest River to Thor Industries. Good Luck.
IMO Jayco is no different in materials and construction than 95% of everything else. Some do have a Norco frame but even those are not bulletproof if you do some research.