Every now and then, usually once per ride I hear a noise under the cab section of the vehicle on what appears to be the passenger side. It sounds like something got kicked up and hit the bottom of the truck. I can't for the life of me figure this out. Anyone have any clue what this is? or if it happens to them. I'm stumped. The truck rides and performs perfectly, nothing seems to change when I hear the noise either, except for that 1 clunk every so often. Any clues?