^ Glad you got it figured out and yes this again proves my skepticism surrounding "mechanics" of any flavor (dealer, tire shop, wherever).
So they attempted to adjust the caster (initially), which was the right call as it was excessive, but didn't do it right and twisted the truck up.
Maybe this experience will help others with blind faith in "dealer service" that has been posted in a recent thread of mine.
As always, buyer beware. Not just with vehicle service either.
It is hard to accept how something that is obviously wrong to even the untrained eye can be passed off as " Duhh, I don't know, I didn't do that, have nice day...."