What Can Cause Uneven Tire Wear 8 3/4 posi ?

I noticed on several hipo mopars I owned over the years with 8 3/4 rear end posi , that the left rear tire will wear down faster than the pass side . Is it because with the torque of the body it shifts the weight off the drv rear tire and plants the pass tires harder to the pavement so it has less friction? your opinions please.