coleman makes a propane one.
I'm in the same boat as you. Camp runs on diesel gen as needed, and running it for a slow cooker makes no sense.
I have one like listed above that runs on the littel green bottles, and used it last year. Worked great on a big fallow roast, and other stuff. I throw all the veggies and meat and seasonings in before getting ready for the evening hunt. Top it off with broth/water, fire it up and put it in the big metal grill outside, so I don't have to worry about the cabin. Come back from the hunt and its ready to eat... I'd recommend it.