I've noticed that I get more rattling going on back there when I have the cover connected to the back seats "hiding" the contents of my trunk. Anybody else agree?

 

While I haven't noticed that, it seems logical, as it's just one more item out of many that could rattle.

 

yea, mine was rattling pretty good. I tried to make it more rigid screwing in some support bars into it, and that helped a little. But i ended up just taking it out and putting a black towel over my speaker box in the trunk.