Hey I picked up one of
these:
http://www.ebay.com/itm/Truma-HEIZG-E24-24V-30-OBT-Propane-Heater-Kit-Bus-Boat-RV-/251564290213?pt=Boat_Parts_Accessories_Gear&hash=item3a926670a5&vxp=mtr

or:  http://goo.gl/BXLVQ4

I offered $50 and it was accepted immediately.  There are 2 left as of now.

It does appear to be brand new stock in it's original box with
multilingual original manual.  The biggest but is that it is 24V.  So
you will need to do some electrical contortions to power the device
if you want to put it in your Vanagon.  It states electric draw of
.4A on low and .7A on high.  Also, there is no control device.  The
manual shows 2 different basic controls and mentions a bunch of
others that can operate it.  The circuit board has empty connectors
that  they plug into.  I need to find or figure out the pin outs for
these before I can test it.  It seems to be capable of low and high
heat output and fan only.  There is no exhaust pipe included.  So if
any of you are up to a challenge this might be a good opportunity.
Edward