What, me worry?
I don't worry about it. In my experience, a few minutes off level isn't damaging. I do try to either park reasonably level or else turn it off when making longer stops such as meal stops, For short durations such as a pretty view, a potty stop, hitching, or unhitching, I simply don't worry about it. In about 15 years with 3 different trailers, I have never had a cooling problem.
I don't know how old your unit is because you have not filled out your profile, but refrigerators made in about the last 20 years aren't terribly sensitive to levelling. Dometic says that if you are comfortable living in the trailer, it is levelled well enough that no damage will be done. A Norcold rep claimed some time ago that you could park with one wheel up on the curb and not harm their units.
John W. Irwin
2014 Touring Coach, "Sabre-Dog IV"