To many people don't realize the importance of getting your refrigerator as close to level as possible therefore ,there refrigerator is dying a slow death and they don't even realize it..
While I level my refer first,then put on the exterior bubbles,I also check for any solid places in the RV to double check that is the same as the refer..It is surprising how different areas of the RV have different stages of level. My currant TC has just one place on the counter that is exactly the same as the refer,both ways..
Buying a used RV always worries me, if the prior owners took the time to level the refer,instead of leveling it for convenience..Even just replacing the cooling unit is expensive and time consuming when it could have been avoided..