I have a Flagstaff HW296 which is the twin to the Rockwood, and like previously posted, it is a "beast". It will easily sleep the 5 people that I have in my family; however, if weren't trying to accomidate so many people, we definately would have gone a different direction.
If it were me, and I was in your situation, I would look long and hard at something like the Forest River R-Pod 178, reason being:
1. still nore aerodynamic that a flat front camper so should be able to get better MPG
2. Ease of set-up. It takes my wife and I about 25-30 min to set up the camper and even longer to take it down. A few minutes is attributed to keeping a eye on out 3 1/2 yo to make sure he doesnt get into trouble, but it is still a good chunk of time. I can guarantee that when you're breaking this thing down in the middle of summer in Arkansas sweating your ass off....
3. The dread factor. While in the scope of things it is pretty small, but when were picking places to stay, I try to find a place that were gonna stay for at least 3 days...because of reason #2. If I had a hard walled, I wouldnt have a problem staying at 14 different camprgounds on a 14 day trip....don't think I would want to do that with my HW296.
Don't take my above negatives as a slam on the camper, because it's not; that being said, when it's just my and my wife after the kids are grown and out of the house, our sleeping facilities will be different.
Good luck with your decision.