When I put dry ice into a cooler, it freezes everything in the cooler. If everything in your refrigerator was frozen, or could freeze without damage, you could do it. I think that is overkill, though.
If you are just trying to keep things cold for a 12-14 hour trip, and the refrigerator has been running (and is cold) prior to leaving, putting a half-gallon (plastic) bottle of ice, from a deep-freeze, should keep it cold. Deep-freezers are normally colder than refrigerator freezers.
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