Ein Blick in ein Tiny House. Love this vintage bus converted into a home. Great idea for a little guest house.
House Tour: A Cute Home in a Small Blue School Bus Apartment Therapy
Sweet little backyard tiny trailer - tiny retro caravan in sky blue vintage travel trailer
Typically the van is going to have raised fiberglass roof permitting the occupants to stand up in the van. Camper vans, as said above, are also a great option.