I apologize if this has been posted before, but whenever i hit a bump/dip there is something in the rear interior of my Jeep (96XJsport) that makes a shrill vibrating squeek. it sounds like it is coming from somewhere around the soundbar but i cant pinpoint it. i had the same problem in the last cherokee i owned so i thought that someone else must have put up with the same. if you have delt with this before or have any ideas as to what this may be and how i could fix it i would appreciate your help. thanks.