Just wanted to add my experience with wheel alignment with respect to my 2013 Nissan Leaf and 2001 Subaru Forester.
Pulling in either direction is caused by Camber imbalance and not by toe settings. Excessive outside edge tire wear is caused by excessive toe-in settings of the tires. Excessive inside edge wear is caused by excessive toe out.
It is rare but possible that excessive negative camber will cause inside tire wear, but this wear is not just the the edge like toe wear, it is spread across more of the width of the tire.
With respect to the Nissan Leaf, unless one installs camber bolts on the front struts, camber is not adjustable. Only front toe is adjustable. Since the rear is a solid axle rear toe and camber is fixed. Although I have seen spacers on sale that can be installed to allow for some rear camber and toe adjustments. Until recently my 2013 Nissan Leaf was showing signs of front outside edge wear. I gave it no thought as I thought this was due to cornering. However last week, I took vehicle in for the recent battery recall, and the dealer mentioned they detected the alignment was not correct!!! I declined to have the alignment adjusted due to cost and I have tools at home to handle the alignment.
So today I looked at the Leaf's alignment. The camber almost matched between the L and R wheels, off slightly by 0.6 degrees. However the toe was completely wrong. The front toe was 3mm toe-in instead of 2mm toe-out. After 1/2 turn on each side, I obtained 2.5mm toe-out.
Couple of years ago, I tried to correct for pulling and crooked steering wheel on my 2001 Subaru Forester. I made some mistakes in my measurement and ruined set of tires with too much toe-in. But it was a learning experience with respect to how camber if not balanced between both sides causes pulling and excessive toe-in caused edge wear.
2013 Leaf SL - purchased 3-28-2017.
Juice Box Pro 40