The third row seats rattle - enough to be annoying - regardless if they are in the folded up or folded down position.
Any suggestions, other than taking them completely out, to quiet them down?

Thanks

 

You did not mention whether or not you checked the bottom latch at the back of the seat(s) to make sure that the latch that locks the seat to the floor is fully engaged. That's where I'd check next.

 

I had this problem, but only when they were in the folded up position. The dealership wrapped some velcro around where the seat connects to the floor and it stopped.

 

I had this exact problem as well. Take out your seats completely then put them back in, but paying close attention to where the rollers land on the plastic piece embedded in the floor of the cargo area. If you flip up both of the 3rd row seats (before you take them out), you will probably notice that one or both of the rollers are wedged up tight to the side of this plastic piece where it angles down. This may sound confusing, but just take the seats out and put them back in and you will probably understand what I'm referring to here. This should fix the problem.