Narnia,
We run an old Engel unit that uses either 12 VDC or 110 AC. It fits into the curb side of the cargo hold. It can run as a full freezer or a split fridge-freezer, so it is a nice addition to the moderate refrigerator in the 2011 3150 RL. You have to watch the power consumption of any fridge, especially if they are a compressor type.
Good luck on your research.
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