Lots of good info here.
We just sold our 2009 Roadtrek RS Adventurous. We bought it used from Fretz in 2013, and put 25,000 relatively trouble free miles on it.
We've done extended travel in it, and only sold it this year because we were moving up to get an AS trailer with a bit more room.
One thing that hasn't been mentioned is resale value. If you ever plan to sell it, you might want to look at what used vans go for. The new Class B prices are astonishingly high, so a used van makes a lot of sense. We sold our five year old Roadtrek for 94% of what we paid for it in 2013.