You make some good points
@Underboss, especially regarding production volume. But I'm not convinced that building a well-assembled RV would require an $800,000 to $2 million coach.
Many of the issues owners complain about aren't engineering challenges, they're basic workmanship and quality-control issues. Loose plumbing fittings, missing screws, poorly adjusted cabinet doors, sloppy sealant, unsecured wiring, and similar defects don't require a million-dollar coach to prevent. They require
better assembly practices and
a better final inspection before the coach leaves the factory.
I don't expect Lexus quality in an RV. I do expect all the screws to make the trip from Indiana.