I have used the Coleman 12 volt cooler, but I plugged it in to 120 volts and used the adapter. I don't think the batteries will last very long when boondocking.
We find the TM fridge more than adequate for 4 people for 4 days, as long as we keep cold drinks on ice. We only have access to shore power about 1 out of 6 trips.
I wonder if anyone makes a free standing propane fridge/freezer that would be viable when boondocking for more than a week.
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