Took my 2011 21 FBS to the dealer this morning. Discovered the left rear tire was quite worn on the inside edge while checking tire pressure. Checked the right rear and it was much worse. Put on the spare and the RR was worn down to the tire cords. Kind of scary. Figure it is loose bearings or poor alignment or both. A little under 3,800 miles on those tires so something is radically wrong. Other minor problems-remote stopped working and the tongue jack blows fuses when raised all the way. (Sounds like a 5er!) Remote turns on but that is all it does. Not really major problems at all except for the tire wear. Really happy with this trailer. Looks like the dealer is getting more into Heartland trailers-several North Trails on the lot--I think ours was the first one they had ever sold.