You can't beat the space in the 3220BH. We frequently camp with 4 adults, 2 kids under 10 and our mangy old dog. It's great. We manage fine, although at the limits of our TV which has 700 lbs less pull capacity than yours. Be conscious of the weights and get the best hitch you can afford, then have fun.

Watch that one bunk in the back over the sofa. It has a weight limit of 150lbs. And the support pole mounted to the swing-up "leaf" of the sofa when it folds out isn't secured well to start with, and then can sometimes get kicked by the kids or dog.

You'll probably also want to install some towel bars in the bathroom, and upgrade the shower-head to an Oxygenics.

Carry an extension for the cable tv line and 30-amp power. The extra length of this trailer sometimes puts them a little out of reach of the hookups at some campgrounds (had this problem at Harper's Ferry KOA last summer).