Glen,
I've seen Trilliums with a number of different fridge types and sizes, so I think there were options. My
Boler has a paper tag inside the cupboard door listing which models of which appliances came with it, and the
Trillium might have info like this inside the closet door.
Even so, you never know if someone replaced the original with a like model at some point. I think the main thing is that the back of the
refrigerator should be vented to the outside and sealed off from the inside. Specifically, the combustion byproducts should not have a sway to get into the inside of the trailer - that's what you're sealing against.
I have seen a number of eggs in which that seal was not great; I'm not even sure how well the mfgrs did it, sometimes. After all these years it is worth checking out, even if you do have the original fridge, in my opinion.
Although I have not tried 12 volts yet, the 120V and 
Linear Mode
