They are Japanese imports, and don't have a loo. If you have a trawl round the Japanese car importer sites you will see what's available. IMHO they're just a dayvan that might work for a weekend at a push.
There is a club for these vehicles it is called the Bongo Fury club. The best sales outlet is www.wellhouseleisure.com.
Some can be found for sale on E-Bay. Dandy(new member) bought his from E-Bay. Try a PM.