Dry ice is fine, although it is so cold that you run the risk of freezing everything in the refrigerator as well as the freezer. Some people say you can wrap the dry ice in a towel to prevent so much cold from being produced. I've never tried it.
Let's be clear about one thing. If you make a 15-minute stop at a rest area , it won't discharge your tow vehicle battery to any degree. Similarly, a one-hour restaurant stop won't hurt anything, provided that your tow vehicle wiring is heavy enough to recharge the battery when you get on the road again. Most are, but some are not. You didn't mention what your tow vehicle is, so no one can answer that question for you. It is the eight-hour stop at Disney World that is a battery killer.
Finally, if your tow vehicle has a battery isolator, the tow vehicle battery won't discharge at all when you stop. The TM battery will discharge, of course, but regarding the tow vehicle, all of the above still holds. Does your tow vehicle have an isolator? Most do, but some do not. Again, since we don't know your tow vehicle, we can't tell. But it is easy for you to determine if it does - and easy to add one if you are at all handy. The procedure for checking has been outlined several times here on the board.
Bill
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