slowcowboy, it sounds like you have a winner there with all that insulation.
On my todo list is researching the details of charging aux.batteries with an idling car.
My Ford Focus will idle with the heater and fans on full blast (both windows cracked open one inch) at a cost of 1.25 gallons per 8 hours. This is an average I got from two tests of 8 hours each. That was low RPM, I have no idea what kind of charging I could get out of that.
Anyway, that was a tangent...and this is what I intended to post here:
(1)Someone else recently posted good pix of how he built a woodstove into his camper. I cannot find it now.
(2) If you still think the wood stove idea is tempting, try a search for: tent stove, tent heater, portable wood burner, etc.
Here's a good starting point with info and pix of many different stoves:
http://www.walltentshop.com/stoveinfo.html
more more more google results:
http://www.kansaswindpower.net/wood_stove.htm
http://goodoutdoors.theshoppe.com/wilde ... stove.html
http://www.snowtrekkertents.com/portablewoodstoves.html
http://ellisstove.com/