good luck if jeep picks up the tab,
but i have to say my 2011 laredo is the same, not noticeable on good road surfaces, but short sharp bumps on country roads makes then "rattle'
ive replaced the rear shocks with Bilsteins and at the same time replaced the upper mounts with KYB,s and also the stabiliser bar end links with greeaseable ones, and while it has quietened it down its not perfect.
the bulletin require the upper mount to be removed and the rubber bush coated with a silicon product, supposedly the bush is squeeking as it rubs on the shock absorber metal upper bush mount.
ive also experimented with lubricating the rear spring upper insulator,
i don't seem to be able to totally get rid of it.
there is nothing loose or worn in the rear suspension, tyre wear is perfect.
so good luck, and PLEASE report back if you have success
oh ive also added extra screws and packers in an endeavour to tighten up the rear bumper cover, also removed the mudflats, these steps have also helped in overall quietening it down.
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