...a "Quiet Hitch" will eliminate the side-to-side rocking of the spare tire and the deformation to the hitch over time. Without a Quiet Hitch, the rocking will slowly get worse...
I have no doubt this device reduces movement and noise but I don't see the need.
I towed 2 travel trailers before acquiring the class C and there was always slight movement of the hitch within the receiver. If there wasn't, you wouldn't be able to remove the hitch without a lot of effort.
There's no way I'll be able to hear any noise from the hitch.
This is a 5000 lb towing capacity / 500 lb tongue weight hitch. I doubt a combined weight of 90 lbs can deform the receiver.