We are currently on a "shakedown trip" with the new 2013 Bighorn 3010 and have found very few problems or issues, other than my lack of understanding some of the new features. However, we have found the "Greystone" fireplace in the rear entertainment center to be quite noisy. The fan, whether on the 750w or 1500w emits a very noticeable (rumble). The dealer said Heartland recently switched to the Greystone fireplace and wasn't sure if this was typical or an unusual problem with my unit. We had the fireplace option in our 2007 Bighorn and were very pleased with it. Anyone else notice a problem with the Greystones?