Ok, I am going with a Dorm. type refig. and have bought a 1200 watt inverter to power it. The plan is run off the inverter/car alt. untill reaching the camp site. At that time switch over to shore power. My figures come out to about 35 amps from the tow vehicle alt. when the frig is running. Do I really need an isolator? Will be disconecting the tow vehicle upon arrival and the tear also has it's own battery.
Frank