Uneven tire tread wear LR tire?

MaysEffect

That is camber wear. If it was toe wear, you'd see diagonal scrub marks across the tire.

The reason why it may be affecting one side more than the other, is because the wheel center-line is off in relation to the other side. You won't get an accurate reading on this unless you use the string method of measuring alignment.

Only indication you might see on a alignment diagram is the thrust angle. If the car had the toe set with a poor thrust angle. You get camber wear on one side worse than the other.

BUT to be clear. This IS camber wear, not toe wear. -6 degrees with poor thrust angle would cause this. If you weighed more,It'd probably wouldn't be as bad. Also -6 degrees is not good...period. Maybe try buying better tires, may help marginally.