Everyone's different, so it's really up to you. I could be happy with a small enclosed cargo trailer with an air mattress. My wife and 2 kids (girls)...not so much. :) We have a '08 Jayco Eagle 31BHDS...I think it measures around 33ft or so from bumper to hitch. Honestly, if it weren't for the kids, it would be overkill. On the other hand, it does make it really nice if the weather is crappy and you get stuck inside for awhile. It's not so claustrophobic. Having the slide-out really helps in this regard. And the back bedroom would be nice for storing things so the living area isn't so cluttered with stuff. Towing it isn't too bad, but you do have to really pay attention to it when in traffic or navigating tight turns and intersections. Most places we camp, it isn't a problem backing into spots. We usually look for places with full hook-ups so they are set up for bigger RV's. But I have run into cases where spots that were big enough were slim pickings. So it can be a bit limiting in that regard.
The camper actually belongs to my parents, but they bought it so that I and my brother could also use it with our growing families. That's why they bought such a big unit. Recently though, they have been talking about downsizing to make it a little easier to move around and just go for short weekend trips and stuff. Plus, a smaller, lighter camper would be cheaper on gas to tow behind Dad's truck. I just hope they don't go too small before I am able to buy my own camper. :)
