I purchased new, but never installed, a Propex Compact 1600 Heater.  These are
very similar to the Carver P4 that you can find offered through list vendors at
times for $650. It is still in the original packaging and comes with everything
you need to install it into your Vanagon (including the correct size propane
ports to hook up with existing propane lines).  I recently sold the van I was
planning on installing it into and have decided to sell it.  I am asking
$550+shipping (I estimate around $20 for anywhere in the US).  For shipping, I
will only charge what it cost to send it from the 97330 zip code to you (the
package weighs approximately 15lbs).  If interested in this contact me at
541-715-5078 or email me at vince_pappalardo@hp.com