This idea just came to mind and I don't know if it's do-able, but if
each state DMV would make available some statistics it might be possible
to find out how many vanagons are registered in each state.  This would
give the list some idea how many there are in the USA. Not sure what it
would take to come up with that info, but every state's DMV has the
info. Just whether or not it can be extracted from them is the question.

John Rodgers
88GL Driver in B'ham Alabama