RoadPro makes 12V powered cooking appliances for truckers. I bought one, but haven't had a chance to try it yet.
www.roadprobrands.com
This is the one I bought. Seemed like the most useful of the items they sell.
This portable saucepan is great for heating Soups and stews, steaming hot dogs and more.
www.roadprobrands.com
If it works well, I might get the frying pan. Ham and eggs!
This portable frying pan plugs directly into a 12-Volt power port and features a non-stick surface and glass lid.
www.roadprobrands.com