A gas refrigerator has a long metal vertical tube with the pilot flame at the bottom. The heat from the flame travels through the tube and is transferred to the refrigerant. The heat transfers at maximum capacity when the heat travels the entire distance of the tube. If the tube is leaning, the heat will not travel evenly through the entire length of the tube, so some of the heat transfer will not be accomplished. Traveling a road at an incline will decrease the transfer of heat. The insulated box of the refrigerator will keep the food cold while traveling the incline. When camping, the RV being level enough for creature comfort, should be level enough for the refrigerator to work. The refrigerator will be most efficient when level.