Loudness is somewhat subjective due to individual sensitivity to sound but I would say mine has the (mostly moving air noise) of a window unit, if that tells you anything. Sounds like you've covered most of the bases on things to check although someone will probably suggest something else. You might check that the unit is tightened down if you think you are hearing vibration. I think some wind noise and compressor hum. is inevitable.
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2015 Crossroads Cruiser Aire CAF27RL, 2018 F250 diesel crewcab SRW 4WD short bed, Trailer Saver hitch with Reese adapter on Ford OEM underbed 5th wheel connector.
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