Most recommendations for level are described in degrees, not percent slope. 3 degrees is usually the max angle, but even this is too much, and it also is different for front to rear angle compared to side to side angle, and these angles are for the fridge, not the RV. This link shows the problem with a 3 degree angle for one of these fridges. https://www.arprv.com/rv-fridge-off-level.php
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