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I did many alignments as a younger man working for Firestone. All automobiles only never did anything larger than a pick up. Never heard of setting Caster more than zero. But that was back in the early 80s.
Surely you meant to say CAMBER at zero degrees, not CASTER! Zero degrees of caster would be like pushing a wheel barrow. IMO
when I bought my grayhawk , I told the sales man it needed an alignment.
I called the dealer after I bought for an alignment , they called the ford dealer to set it up, and then they gave it off to a big truck alignment shop. But I am under the impression that Ford paid for it.