ddvette9 im with you on this one... i started getting that noise this summer. I have driven around a parking lot just listening to the back and I hear it from the rear cross bar. I took at look at the third light but its seems to be ok not much wiggle room for a rattle, but from what i can see the plastic housing expands a lot more than the aluminum casing of the cross bar, and this causes the aluminum shielding to rattle.
once you turn the AC on and the cars temp "equalizes" it goes completely away.
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Where are my aluminum pedals? 
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