We've got a 2010 Mobile Suites and while there have been a few problems, none were major. We sold our home and property and live full time in ours in Oklahoma City. (At least until we retire.)
If you do consider used, check with Rolling Retreats in Elk City, Oklahoma. They started out buying used DRV products at auction after they had been repossessed. They are now a full DRV dealer and have sold a bunch.
http://www.rollingretreats.com/
They are a "mom and pop" type place and only sell DRV's or whatever gets traded for a DRV. They are good folks.
While we were researching for our Mobile Suites, there were lots of complaints about problems. However, every manufacturer has problems but DRV has a good reputation for working with their customers.
Terry