The newer fridges are supposed to have more tolerance based on larger tubing that offsets somewhat the pooling of the liquid if you are off level. I've often heard the term that if the level of the trailer is uncomfortable for you inside, then it's bad for the fridge. I'm old school and I level my trailer as well as I did back in the early 80's. It might be overkill but that makes everything work better, cabinet doors, drains in the sink and shower, and the milk in my cereal bowl......
'04 Classic 30' S.O.,'03 GMC Savana 2500,'14 Honda CTX 700