Personally I think theives don't want vanagons.
Just what is in them. Being as big as they are, they
figure there is something of value inside. If they are
stealing a vehicle for a ride, a Vanagon many get
a little to complicated, because they are not common
as the average GM or ford, produce on the market. If they
are looking to sell parts, well they are going to have
a hard time figuring out who wants what and what it
is worth, and even hidding the shell. So they just
take what is inside.
                      Eric