Wow...what a difference! I put an old 1" foam full size mattress pad folded up to fit most of the open space under the bench next to the cool cat. I left about 6" open space next to the cat just in case some air flow is needed. So much quieter now...as mentioned above, the empty space was acting like a resonator - amplifying the vibration noise from the cat.
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2015 Rockwood A128S
2010 Rockwood 2604
2014 Ford F-250 CC SB 2WD
2008 Toyota Sequoia 2WD