Nothing is wrong with my tires or suspension. In the videos I posted, I was driving over a pavement that has these little grooves cut into it. As my tires rolled over that section of pavement, the tires produced audible vibrations (sound). It's similar to the rumble strips on the side of the road to wake you up when you're sleepy, but the grooves are much smaller, so you don't feel the vibrations. I believe aliens chose this method to talk to humans.