Being unlevel is more critical front to back than side to side. Either way
is not as much of an issue as seems to be written about. I read a book on RV
and mobile refrigeration, and the old author said that he had seen a damage
refrigerator from this unlevel operation only once in his experience.

Personally, I think the reason that the Dometic sucks is that the hydrogen
that is mixed with ammonia has leaked out, leaving only the ammonia behind.
Hydrogen is very light and must be difficult to contain. Can't see any other
reason for the poor performance, as I have tried and tried everything to get
mine to work like it should and cannot get the results I want. I don't
understand how someone could sell a unit like these and have them not work
reasonably good,somewhat similar to like we are used to at home, when they
are new. Many of them sure don't work good now, and I think this is the reason.