Update on the intermittent low base hum and vibration. So as I said before I managed to get the truck to Chapman Dodge, Chrysler, etc in Yuma Arizona while the intermittent problem was actually happening. The mechanic drove the truck with me and confirmed an unknown problem. It has been a week, and the dealer notified me that they found the problem, and are waiting on parts. As soon as I find out what they found I will let everyone know what they found. PS , Moosum they had no idea of what it could be, when I took it to them. Hope they are not just guessing, they seemed pretty sure they found it.