We burned up a fridge at an off-level campsite a few years ago. Said to heck with eating up precious vacation time calculating degrees off-level at every rest stop and campsite. We bit the bullet and installed an ARP unit (aka Fridge Defender at arprv.com). Just install a temperature sensor on the flue and wire the ARP unit between the 12v power source and the fridge and you're done. If the temps get too high the ARP simply shuts off DC power to the fridge.
The ARP also displays flue temps. In very little time you'll get a very good idea just how off level you can get before the flue temps start increasing above 375 F. (190 C)---standard operating temp for our fridge. After using the ARP on 3 different fridges, we've discovered not all fridges are created equal. With our 2nd fridge, simply pulling off the side of the road (with a slight lean to the right) would set our flue temps soaring. With our current fridge, we can go insanely off-level before temps start to climb.
Nowadays we go anywhere we want and never give our fridge a 2nd thought.
