Over rough roads, I can hear a rattling noise that seems to be eminating from the passenger-side rear of the vehicle. I assumed it was the trunk cover - but after removing it, the noise is still there!
I took a look at the sliding piece that extends to cover the tailgate-gap, and it seems fairly well-secured, so I'm really not sure what else it could be... Any ideas?

(My X5 is an 05 4.4)

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- Aaron

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