Washer in our Legacy does the same thing. I think the main issue is that it IS anchored directly to the coach frame, which then transmits the vibration. I just figured it was a matter of "that's how it is".
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2015 Legacy SR340 360RB with 2014 Wrangler Unlimited Toad
Gigi, Poppy and Sadie the Jack Russell (all 14 lbs of her)
2015 Legacy SR340 360RB
2014 Jeep Wrangler Unlimited Toad
Gigi, Poppy and Sadie Lady...On the road, but not full time!