First step a generator run off wood gas. To start the process
take a look at
http://www.green-trust.org/woodgas.htm
If it will work for a VW will it work for and Ford Escape and what will the inspection station say? I like the trailor approach.
Though thinking about it a Ben Hur trailor and the HUP might be the better choice for a test subject. That stove bolt 6 should run on anything.