I agree that careful packing is the most important consideration in keeping items from getting tossed around in a vehicle fridge. We just returned from Africa where we rented a Land Rover with a top loading Engel fridge bolted inside. The trails were so rough that even our eggs inside of a plastic egg box were crushed, making a gooey mess inside the fridge.
In our US off-road adventures we have used three different front-loading fridges in different vehicles. Food has always survived with minimal damage, but the fridges get stained by aluminum beverage cans bouncing around in their compartments.
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