If your trunk or hatchback rattles it could be that the weatherstrip has compressed to a point to where it isn't holding firm against the truck lid or hatch. Replace your trunk or hatchback weatherstrip with one of LatemodelRestoration.com's quality reproduction pieces.
I have been ordering items from Latemodel Restoration for many years. I've found them to be exceptionally professional, timely with order processing and shipping correct items ordered. I've never received an incorrect item on an order.