I have a thing called a Stove-To-Go made by Max Burton, and it is pretty
close to a crockpot. It's lunchpail size. about 10"x7"x7", runs off the
cigaette lighter, but also plugs into 110V if you're connected to shore
power. It's very popular with truckers, and you can usually find them at
the big truck-stops. They heat up sandwiches nicely,  we've used them
canned food like spagetti-o's for the kids, frozen food like shrimp come
out great in them. You put an aluminium liner in it and put the contents of
the can in the liner, plug it in and cook while you drive. Anything you can
wrap in tin-foil or put in the liner works. I've used it on several trips
and been happy with it. I think they cost about $30.

Don Kane
dkane@mail.arc.nasa.gov