Absorption refrigerators are commonly used in Recreational Vehicles (RVs), campers, and caravans because they can be powered with propane fuel, rather than electricity.
No confusion, that's how the refrigerators work in our '81 VW camper and our much more modern Sprinter RV. Last I was in a position to know such things, many Amish use absorption fridges as well.
You mean fridges that use propane as fuel or ones that use it as a freon?