If you have a DOMETIC refrigerator
, the following is the company line on leveling.
FIRST: Determine if you have an Early or a Late design Refrigerator
Early Design: Has a Square edge cover around the boiler, that's the big vertical thing on the back of the refrigerator.
Late Design: Has a Round boiler cover
SECOND: Level as follows:
EARLY Design refrigerators are more sensitive to being level when operating and should be level within 1/2 a bubble width as measures on a Bulls Eye level placed on the freezer floor section. (Dometic used to supply a bulls-eye level with these refrigerators, they are available at any RV store and even Wal-Mart.
LATE Design refrigerators are less sensitive to being operated out of level and the rule basically sez to "Level the trailer until comfortable for it's occupants" (Dometic no longer provides levels with new refrigerators.
I "Super Level" my trailers refrigerator one time with a bulls eye level, then I attach outside levels, center front and directly over the axle
center, indicating "0" tilt and use those for all future leveling. The 40+ y.o. Dometic in my Hunter still works great on both 120 VAC as well as LP.