A few tips needed on appliances in our new 1975 14ft scamper

First, your refrigerator, if original, will most likely not have circuit board. Fridges from that era used manual controls to switch from gas to electric. And yes, Rav refrigerators need to be close to level to operate and if operated out of level, can be severely damaged.
Also, an absorbs ion fridge will usually take 24 hours to read operating temperature.