Heel - Toe Wear
Each lug around tire worn high to low from front to back edge.
Most often caused by mismatched inflation pressures or tire diameter in a dual assembly and certain conditions. Certain conditions such as P&D operations, high torque, sharp braking and mountainous terrains aggravate this condition.
Avoid sharp/fast braking and starting. On a dual assembly both tires should be same size, same pattern.
Check and maintain tire inflation pressure with a quality air gauge periodically. Regularly care and proper maintenance on vehicle mechanical system. Run out on drive axle. If severe, change direction of rotation until tread is worn to point of retread.