I'm having this issue recently after getting new tires and the web indicates it might be an alignment or worn parts issue. Our truck has just over 20k miles and does not ride rough, noisy or drift when on level ground. Tires are inflated 75-80psi. In the pix, it is more severe than is showing on my tires but is like each step has its own ledge very slightly. Only on the outside and more pronounced on the drivers side.