Could someone please tell me what this banging noise is everytime I drive on a bad road (parking lot) or go over a speed bump? It only comes from the back of the car, like under the truck area. And it is driving me crazy. I keep thinking it's my shocks or struts. Could someone please help me out, and tell me what this noise is? Sometimes it sounds like something is loose, and I don't have a sway bar so I don't know what it could be. Please help!! =(