My 08 made alot of noise on the way home the first day, removed the bags to check the mounting bolts, but I found the mounting area behind the lic. plate was most of the cause, 1 bolt was held there by the temp. paper plate, the other was almost out, great dealer prep job befor delivery,guess the $500.00 plus they charge didn't count towards loose bolts, the other noise came from the pass. back rest pad, there is a 3 point mounting and the center has a steel triangle that pionts to a plate mounted to the body of the trunk. Try to reach back and push the back rest when hitting those bumps the cause the noise to see if this makes the sound go away, I ended up gluiing a piece of flat rubber to insulate the metal to metal sound