NRALIFR I already own a honda 2000 I got for free but to hook it up and have some sort of locking system it might become a pain although I was looking at a torklift sidekick, my fridge is a 7.3 cu ft is the heating element only 325 watts for that if it is than a 500 watt inverter hooked to the truck batteries would do just fine then use a heavy duty extension to not loose to much power and go through the vent and plug into the fridge direct at the back just might be the ticket just have to find a way to isolate the batteries and inverter when you shut off the truck so as to not drain the batteries.
Dave