There is a Wikipedia article about rv fridges
https://en.wikipedia.org/wiki/RV_Fridge?wprov=sfla1
It's pretty technical - I skipped a lot of that. But, in terms of damage protection, it mentions the invention of something called the Absorption Refrigeration Protective RV (ARPrv) Controller. "This discovery has solved most of the operator error issues such as off-level operation of the fridge." It doesn't mean you can operate at steep angles , just that it won't damage the fridge. But who knows what fridges have this!
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