Thanks everyone for your input.
I'm assuming you never took the fridge oit of the car/camper in order for mold to build up?
I'm mainly interested in lowering the amp draw to make it last as long as possible, as I only have the single 55Ah secondary battery
The covers are $60. The fridge will sit in the rear of the D3 and may get a bit of sun on it during the day.

