The Airstream Sprinter Westfalia was apparently popular with soccer mmoms (according to dealer). Seats 5 and sleeps 4.
Believe a family of four or five travelled full-time and homeschooled the kids for a year or more in an Airstream Westfalia. They supplemented by towing a cargo trailer.
As main purpose of vehicle is not to live in, a cheaper alternative maybe a full-size passenger van (with the safety of original seats, etc.). Then supplement with a composting toilet/Porta-Potti in rear with curtains and a removable tied-down all-in-one kitchen unit (fridge, sink, etc.). You would miss out on the heavy weight, fresh water and waste tanks, complexity, etc. Think of the van as a huge tent, which carries limited camping amenities. No issues re RV restrictions.
