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"Clunk" sounds in far rear of Suburban when hitting bumps.

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On bumpy roads, I get "clunk" sounds from the back of my 2021 Suburban. 

It was particularly annoying went I drove out west this summer and drove some highways with closely spaced joints.

It was clunk after clunk.

I suspect it is the rear window but, upon inspection, I can't find anything wrong with it.

On smooth roads, it is quiet.

Anybody else experience anything like this?

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