I just saw this thread so maybe its too late to help you. But perhaps others have the same question.
Our Lil Snoozy
was built last year with a Truck Fridge
and came from the factory with the fridge
hard wired into the 12V system. It turns on and off from a switch in the fridge
. We didn't order the 12V/120V combo fridge because the Snoozy has a 35 Amp WFCO converter to supply 12V power for the trailer. No need to pay extra for another converter in the fridge.