Best way to describe it. While driving at slow speeds and mainly when the truck goes dude to side over bumpy roads there is a very noticeable clunking sound. I cannot pin point where. It sounds like it is coming from in front of me but am unsure. Only audible at speeds up to 10mph. Never when driving in a straight line, only bumpy side to side movement. Seems to be getting louder recently. Truck is going into shop in two weeks for unrelated issue and would like to know what to tell them to look for. Thanks