I didn't do anything to it yet... I just stuck a couple of rags around the edge that rests against the tailgate to see if that prevented the occasional *clunk* that I would hear over big bumps.
At this point, I don't think that the tailgate slats are the culprit - I think it might be the trunk hatch itself. I noticed that the trunck hatch started clunking even over medium bumps not too long after I got the X5, so I backed-out the torx screws in the bump stops to make a tighter seal. This helped a lot - made it almost silent - but I think it's still producing the occasional big-bump that I hear, so next I'll try sticking the felt pads on the bump stops as described in this thread

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- Aaron

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