I've seen some interesting "Tear-drop" style trailers recently, none behind
a vanagon, but other small vehicles are using them.  These, and I have seen
a few different types, usually have a door at the curb side and another
"hatch" on the back/top.  Some have a cargo space back there and some have a
cooking area built into that area.  They look pretty well made (from a
distance) and have semi-normal sized wheels.  The ones I've seen seem about
6 feet high and maybe 8' long..
  Interesting side fact:  Last I heard, you need no license or registration
for utility trailers in Oregon, and they are often-swiped there...Also, in
Washington state, you have to have a vehicle license for a slide-in
camper..No wheels, no motor, but you still must buy a separate vehicle plate
for the camper..?
  Don Hanson