The Thought has Occurred to me as well!
Just a few days ago, I put the this very same question to our visiting guest expert on refrigeration. While Mr. Kohlman was extremely helpful to many of us on refrigeration concerns, my query concerning why no one had looked into propane refrigeration, was dismissed with the reponse: "Propane refrigerator are not designed for or recommended for use in boats".I am old enough to remember when gas refrigerators were commonplace in my home town. My parents had one for nearly 10 years.Is it due to some safety that we have not seen these units on boats or is it perhaps a matter of fuel consumption? Would be a boon to to cruisers. Anyone have any thoughts?