I wonder if this could be mounted in the Vanagon engine bay?

http://vehiclepower.com/MEP02.htm

Perhaps mount the unit where the AC compressor would go (assuming you
don't have working air conditioning in your van)

Serious 110v power when the engine is running...just think, big power
tools, microwave, blender, whatever when you're out in the boonies.
No need to carry a Honda generator. No need for a big invertor...but
you have to run your engine for big juice :(