You need hub shims. With the camber being out that far, it is affecting caster when turning. Ackerman was a jerk.
Good luck finding a "good" alignment shop..
I learned not to trust anyone anymore so I wouldn't rule it out.I've put 3 boxes on this truck. The latest box is a Redhead box. I've adjust other boxes and really only noticed the steering got "harder" and didn't really help anything. So with this more expensive Redhead box, they say they are adjusted to proper spec for your application and not recommend adjusting the preload. What do you think?