Just to conclude this thread, it works! Both gas and electric work. A solid 24 hours on gas and it was awesomely cold. Once I brought it down to temp I switched it over to electric and it held a nice cool temp.
We took the trailer out for a test drive and stayed in it for 5 nights at a local park. My daughter, fiancÚ, 3 40 lbs+ dogs, and myself stayed there with a guest most nights and were comfortable with minimal organization. The fridge took some pretty heavy traffic and still kept everything cold.
This silver bullet is gonna make a cozy little home for us in the next year while we build our house.