I have a 2019 Cornerstone that has been on one trip (3 days & 500 miles). I've owned it since Mar and continue to have to have it in the shops for problems that the service people are "having trouble duplicating". It was scheduled to go back in this morning at 8:00 AM for an upgrade to the Spartan/Hadley Air System - the most serious, unresolved issue I have - but...