I brought the Tribeca into the shop to get the rattle looked at and they said that the hatch is misaligned. They took a look at the way it as closing, phoned the Subaru Tech Line and came up with the cause. It makes sense to me because I stuck a couple of flat plastic pieces on one side of the hatch (on the rubber hatch guiders) and it minimized the issue. This discs are normally found on the bottom of chairs which are used to protect the floor. I think a lot of people who are using towels, and other items to fix the rattle are having the same problem. I have to take it to a body shop to get it looked into though because a normal service center doesn't have the equipment to align the hatch properly. I'm starting to wonder if the hinges being used on the 08/09 Tribeca are strong enough to hold the hatch into place. I suspect there is going to be a TSB on this issue relatively soon because I've found all kinds of people complaining of the same issue (especially in colder locations).