We originally had a 2720 (there are only 2 adults) and storage was a little tight, but we managed. We went to Florida for 3 weeks and did not have any problems. We bought some hanging shelves. One hangs over the bathroom wall by the kitchen sink and the other over the bathroom wall by the bed. We stored food (mostly lighter stuff like cereal boxes, etc.) on those. Now we have a 3023 and there is more storage in it. We have also found over time that there were things we took, but never used, so we took some stuff out. It will just take some experience to decide what to take and how to pack.
Link to shelves:
http://www.meijer.com/s/neu-home-ove...ooks/_/R-45151.
We also bought a hanging towel rack to hang over hall-bathroom door to hang towels.
My DH shops Goodwill for stuff like that and has found some real steals!
Stacking stuff and collapsible things (like bowls, colanders etc,) also helps.