[bushpilot]

check out the edgestar -

we have a 64 quart model, been a good one, it'll freeze down to -5 degrees (f), its thermostatically controlled and auto switches between 12vdc and 120vac depending on whats available.

I had to trim the stiffening lip of the storage bay to get he cooler to clear, but then i put ours on heavy duty slide rails...