Level is the most critical issue for RV absorption fridge operation regardless of heat source (electric or gas).
The ammonia cooling solution depends on proper gravity flow in order to make it's way down thru cooling unit. Off level operation interrupts the proper gravity flow which results in overheating of coolant...when coolant overheats the corrosion inhibitor turns to crystals which attach to the inside of tubing and causes blockage which causes more overheating, more block etc. until cooling unit DIES. Blockage is permanent and the only fix is replacement.
Electric or gas is just the heat source.......doesn't matter.
LEVEL matters!