I'm aware it don't happen for no reason. But I'm thinking the wear started and is just compounding. Once a tire starts to wear a bit it only gets worse quicker. I've pried and poked everything I can with truck in the air. When I get a chance with wifey I'm gonna drop truck to ground an get her to wiggle steering. One tire could have issues as well and might have caused that to the other tire. But I don't wanna slap new ones on and watch them get all puckered too.