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

[studly]

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?

[fatkat]

There is a bulletin out for the rear window, but it should be more of  a rattling sound

 

PIT5768

 

https://static.nhtsa.gov/odi/tsbs/2020/MC-10179650-9999.pdf

[20L8TSierra24]

Spare tire loose?

[studly]

I experienced more of the clunking noise today.  Interestingly, it seems more prevalent when I have something in the back cargo area.

I am starting to think it is the hinged door over the rear cargo storage compartment that is making the noise. 

I put a bunch of towels over the contact areas to see if that dampens the noise.

[JR09country]

I had a similar noise in my Tahoe and it wound up being the jack not being secured in the compartment.

[studly]

Today, I used weather stripping to pad the support points for the rear storage cover.  The "thunking" is gone.

[JR09country]

Definitely get noise from that as well. That piece should be more secure than what it is from the factory.