Hey guys, I need help. I just traded my silverado for a used one owner 07 Tahoe. I really like it but I have a very annoying rattle that seems like its coming from the driver passenger door area. I thought it was the seat belt part in the pillar but it was not.

If felt around everywhere and can not pin point where it is coming from. Everything sounds solid and feels secure. It sound like glass or metal bouncing around inside the door panel maybe. I checked the window and everything is good. I still have some factory warranty left but i hate to take it to the dealer for that because they always act like they can not find rattles or squeaks. Has anyone has this problem yet with that same rattle. IT sounds like sheet metal bouncing or something and its almost ALL the time unless on a completely smooth road and we have many of those!!!