The front isn't a problem at all! Less than -1 deg won't create any abnormal tire wear.
However more than -1.6 on the rear will cause tire wear on the rear. IF you don't want to replace the tires every 15k-20k miles then you should have cams OR off-set bushings installed.

Caster is the adjustment for pulling! IF the roads have a large crown then upto a half degree more on the right side will help pulling on htis type of road.

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