Catster is the relationship of the upper ball joint to the lower. It is set in the specs to help turning. It will not effct your tire wear until it is way out. I would not be real worried about your setting. I do have to ask why didn't they fix this during the alignment. When they had it hooked up they should have shimed the upper contorl arm to bring it back into spec. This SHOULD have been done if you bought a alignment.
Normally you do not have to mess with caster/camber. only when something wears out or you hit something. Has your truck been hit or did you run up on a curb.
Do not feel bad I used to work for Acura. When one of there cars hits a curb it is a subframe. We can not put it stright cause it would bend the subframe. OUCH
Let me know if you need more info
Matt " 9 hours @ work and 5 2go" Tharp
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