Had a rattle in the tail for 4 years on and off, tried everything mentioned above but nothing helped until I found that the rubber/plastic strip on the inside on the top of the glass needed a clean and a bit of vaseline.
Has been rattle free for 6 Months now, knock on wood!

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The most repeated sentence I heard from my dealer was "I'm sorry YOU are not happy with our service" so it was still my fault.

oil the passanger. Hopefully she likes it.

Sorry could not resist.

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It's not a car
It's not an SUV
It's not a truck
It's a JEEP!

Could also be the internal frame rattling against the door skin. That is what mine was, myself and a tech were looking at it and we took the spare off and looked real close at the skin and the tire carrier, apparently someone hit me and it pushed in enough to break the frame on the inside, yet with the tire on we couldn't tell.

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I'm baaaaccckkk...
LOST Member 10
If you can read this you don't need glasses, go Wheel your Jeep!