Trevor - Uh, you know we have a fairly nice "oven" sitting back there in
the back of our Vanagons!  Not really sure just what the ambient
temperature is in the engine box back there, but when I was in vet
school at Auburn University, on the way back from Naples, FL, I wrapped
a 5# Boston butt roast in multiple layers of aluminum foil, placed it in
the engine box of my '62 VW Van and 12 hours later, when I got to
Auburn, the damn thing melted in our mouths!  Got the idea from my
brother's in-laws, who used to drive all over Florida in their old
pickup truck with a camper on the back.  They used to stick roasts,
chickens, potatoes, carrots, etc. up on the 390 Ford V8 in their truck
whenever they'd head out for the next camp site.

As far as crock-pots go, the little one I have draws 4amps @120vac.  I
suppose, as long as one has a decent alternator in their Vanagon, one
could just use one of the little cheap dc-ac inverters to run their
small crock-pot while driving.

One thing about crock-pots, they are capable of turning a really BAD cut
of dead animal flesh into something really delightful, if used properly!

BOB - WA4RRN
'85GL "Bourgeoise"