As Dave said, some mfg's are recognizing that and opening mfg' service centers...
REV, a holding company for a handful of rv brands as well as commercial trucks, etc...
opened a regional service center near us in Cleburne, Texas...
I called them and while they MAY work on all facets of the rv for the new owners, for 'second owners' I got the impression they would work on only the coach and not the chassis.