My R/T has developed a rattle at cruising speeds. It's coming from the passenger side. I have tried to touch all the exposed surfaces that I can reach while driving and I can't stop the sound. It's not a problem with the radio on, but I have to find this thing. I can take it to the dealer and hope for the best but I hate to have mechanic's crawling around my car. Hopefully they can find it. Over time it will make me very unhappy.