On a recent 800 mile long trip, I noticed a slight knocking sound coming from either the front suspension, or the steering at very low speeds...(below 10mph). At higher speeds everything is fine. Of course I'm planning on having the dealer scope this out before my 3 year bumper to bumper warranty is up, but I wondered if any of you might have some theories on what might be the problem. Being forwarned is forearmed as far as I can see it, so I'd appreciate any comments/help that you can provide...Thanks in advance.