I have looked over the offerings from Engel, Dometic, Isotherm and Norcold and find that the only thing with dimensions small enough to fit in the cooler locker are the smallish 33L models. I did find this 45 qt. portable fridge/freezer at Best Buy but I'm not familiar with the brand. The dimensions are a perfect fit for the locker and it can be plugged in to both 110v and 12v, running off 110v when available, switching over to battery power away from the dock.

Any thoughts? The reviews I found on line were almost all 5 stars.