When I first started out I have bought 3
12volt crock pots for any drivers that wanted to make their own meal on the road. So far only 1 guy uses them regularly and he hasn't had any issues that I know of. He's never mentioned it melting in to a blob so I imagine it still works fine. The other two get used on occasion, I suppose the other LDD's prefer to eat fast food.
I imagined that a crock pot would be easier to cook with, throw it all together and plug it in, pull over that evening and eat. Though it does limit you to mostly lunch\dinner time meals. I believe there is a crock pot recipe book floating around a barns and noble in town.