Most absorption fridges will work properly as long as they are within 2 degrees of level side to side and 4 degrees of level front to back.
looking at the fridge : New models of RV fridges are more forgiving, with proper operation within 3 degrees of level side to side and 6 degrees of level front to back.
If your rv is 22 feet long, it would have to be approx. 12-14" off level in order to be more than 3 degrees off level.
Even though I have a 4 way set of levels inside my MH, if I pull into a rest area for an hour to three, if its feels level im ok with it.
If my doors are not slamming closed and my sinks are draining, I have been fine with that degree of being level my entire rv life, never having to replace an rv fridge.