Originally Posted by plumber64
What do the fridge manufacturer's say? 1-2, 3-4, 5=6 degrees in which direction. I have heard all the above and more. I set up per the auto function and keep track how it cools.
Direct from the manufacturers installation manual (this verbage is from Norcold):
"The refrigerator is made to operate within 3 degrees off level side-to-side and 6 degrees off level front-to-back (as looking at the front of the refrigerator). Operating it at more than these limits can cause damage to the cooling system and create a risk of personal injury or property damage. Make sure the vehicle is level before you operate the refrigerator."
Dometic manuals only state "the vehicle needs to be leveled so as to be comfortable to live in". It also adds that when the vehicle is in motion the leveling is not so critical, as the rolling and pitching of the vehicle will keep the ammonia from accumulating in the evaporator tubing.
Considering manufacturers build in considerable idiot-proof leeway into their products and inherent "cover our butt" protection, the general rule is if you can comfortably walk sit and sleep in the camper the fridge is going to be fine.