Purchased 2010 big horn 3670rl in Feb, was in shop the next month and many times thereafter. In August the caulking on the cap was cracking and come to find out either the factory did not weld the studs or they broke. The wall was flexing. Heartland agreed to take it back to the factory to repair but there is still a lot of time to camp in my area. This happened after adding a Cummings Onan generator, a second a/c in the bedroom and a washer/dryer. Yes, I traded it in this week and it was not a Heartland.