Before jumping to the conclusion you need an alignment just for caster, I would probably assume for starters that last time it was set you had decent subframe rubber and this will return it to that situation and just drive it first and see if it has that excellent MB tracking or not.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.