Michelin XDA Energy or Bridgestone M713 drives?

[Rawze]

(12-23-2021 )SquareOne Wrote:  ...
when I get down eye level with the tread I can see a very light 'stepping' from the rear to the front of each section of lug. Could this be cause be all the siping? Would the siping cause the flex and maybe abnormal scrub? When I see other trucks with the same tires I notice a similar pattern as long as the tires are wore to about the same depth. ...

That is caused by how hard you push the pedal up a hill and have it under high engine loads. The harder you push it up hills, etc.. the more prominent that type of wear is. It will also be the most prominent on the passenger forward rear axle, more than anywhere else, due to flex. That is the point where there there is the most twist in the frame, and that set of tires will slip the most in a hard pull.