With these trucks you can't adjust caster much at all - any attempt in doing so will destroy the pivot shaft bushes in the upper control arm. The camber is adjusted by shims between the pivot shaft and frame rail. No matter how badly fubar'd the frame could be, they can always slot a few more camber shims in there to alter the angle unless it has been bent inwards and radically increased the camber angle (not the case going by the alignment test). How are all the bushes and joints? And there is always a possibility there is something bent under there and they haven't been able to precisely spot it...