"Bob La Londe" wrote in message
...
We used to use a 12V fridge on road trips when I was a kid. My dad
put a second battery in with a battery isolator, and some rather
large gage wire (fused) directly from the second battery to the
fridge. Never had an issue other than that the battery would run
down if we were parked for a day or more.

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Bob La Londe

http://www.adventureparents.com/blog...ruck-or-camper
"Unquestionably, a good fridge/freezer is going to cost you close to
$1000,..."