The ones I looked at are for marine use.
They seem save if say in a propane locker in a lazerate. However if we cannot get insurance then it is a no go.
We originally wanted to buy a Gemini MC but found they were out of our reach finically. You can insure the Gemini with the propane refrigerator.
We are in the process of selling our current 30' keel boat and buying a 36' keel boat. Got to keep the economy moving you know.