dual fuel conversions on vanagons are very common in germany now, as propane
is far cheaper and more environmentally friendly. i would love to convert my
van at some point.
i have not heard about propane tanks inside the vehicle., though. some put
it in place of the spare tire, although i guess that would be illegal in the
u.s....
last time i wass at my van repair shop  in germany (i dont work on my
europena van myself) there was a line of vanagons waiting for their
conversion.. around 1800euro.....

flo