The deal with it being level when parked is that the slant of the refrigerant plumbing is close to level, and the fridge uses gravity as the motive force for the refrigerant, if the fridge is enough off level that some of the tubing is level or at a reverse slant a chemical in the refrigerant will back up and plug the tubing, therefore stopping the fridge from running.
The reason that's not a concern when traveling, is that the fridge will be moving from side to side and back and forth so the refrigerant is in constant motion and there's no danger of it pooling in the lines.
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Salem 29RKSS Pushing a GMC Sierra 2500HD!
Gotta go campin!
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