I recently bought a used G12SRK
We've been enjoying it. Ours is a 2019 model. Watch out for them delivering your unit with only a 110V AC Refrigerator... That seems to be a common problem recently.
My unit has a refrigerator that runs on Propane, 12V DC, or 110 AC. That's what you want. If they don't set the unit up in advance for a Propane refrigerator, I think the retrofit would be a real pain. Propane Fridge requires venting to the roof of the unit..