Level
Sam,
All the years I've been around campers I've heard that the refrigerator needs to be level to operate properly. So when I've installed new levels I insure the refrigerator is level (checking foward and aft as well as side to side) as best as is possible that then install the level. I check it both ways because my Hi Lo came with two levels. One on the front and one on the side. Once I install the levels with the refrigerator level I use them to level the camper once we arrive at a site.
Some may not agree with this. Example, I once had a new refrigerator installed in a 5th wheel I owned. The mechanic told me the refrigerators do not have to be all that level to operate properly. Don't know if I believed him or not. So I aim to end up with the refrigerator level.
When I considered answering your post I went and checked the Manual that came with our Hi Lo. Didn't learn much there. So I pulled the manual on the refrigerator. Here is what Dometic says about their refrigerator being lever. I'm picking up in the middle of a paragraph.
" The tubing in the evaporator section is specifically sloped to provide a continuous movement of liquid ammonia, flowing downward by gravity through this sectioin. If the refrigerator is operated when it is not level and the vehicle is not moving, liquid ammonia will accumulate in sections of the evaporator tubing. This will slow down the circulation of hydrogen and ammonia gas, or in servere cases, completely block it, resulting in a loss of cooling.
Anytime the vehicle is parked for several hours with the refrigerator operating, the vehicle should be leveled to prevent this loss of cooling.
The vehicle needs to be leveled only so it is comfortable to live in (no noticible sloping of floor or walls)".
So while it sounds like it does not have to be perfectly level it does make one think that the more level the refrigerator is the better cooling you can expect.
Guess that's why all the fuss on getting the refrig level.
God Bless
Papa