We are heading out on Friday for a trip to Rapid City, South Dakota from Fairfax, Virginia. Planning on stopping in Columbus, Ohio and Greenville, Ohio to tour the KitchenAid factory. On our way home in a week, we are going to hit KC for some BBQ. Looking forward to the trip...Has anyone used one of those mini refrigerators for the car? If so, was it worth having over an ice chest?