My Dometic A/C is awful.... on a scale of 1 to 10, mine is a 9 on air noise. I don't get too much vibration though. Maybe Jayco can help with your A/C issue.
The best cure for vibration and movement in my trailer was a set of JT Strong arm stabilizers. Words can't express how much they helped my trailer.
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Sold RV.... downsized to a 6x12 cargo trailer with Starlink and mini-split A/C. Easy to tow at 1200# - real happy now.
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