"clanking" noise when hitting medium + sized bumps
Today I was driving with my windows down and noticed a clanking noise coming from under my cab. So, I turned my stereo down could here it even better and determined that it only occurred when I hit a significant bump in the road (small pothole). I thought it was something to do with my spare tire. When I got home looked but it was nice and secure with no play. I thought maybe bumper or tailgate but both were fine. I looked under the truck, but couldn't climb under cause I was dressed for work, and couldn's anything metalic hanging loose. Any suggestions? Ps I have also noticed a rattle day to day while driving over bad streets.