I've got news for you, Larry. Our coach has been parked by the house for almost three years, and I developed a leaking electric bay, a bad windshield seal, a malfunctioning Fantastic Vent, the entry door window developed a faulty window seal and fogs up, the shower dome has vapor between its inner and outer panels, and my daughter dinged the bottom of the rear cap with the lawnmower (don't ask).
I think the only way to avoid having to regularly repair something on one, is to not own a coach at all.
Joel