Just today I made an adjustment in the MB dealer. Sure they made all possible the best by my pain-in-the-assing, and it goes straigh and very good.
About 90 mph? I don't think it's a good idea to go in such a high speed, just sometime to try, you have a good I-75 for that
Alignment is trivial once the adjusting bolts have been broken loose. You can do it yourself with not much more than a piece of string and a fine pitch ruler. I wrote up a DIY on the site-cannot-be-named. Google for the words "string alignment g300dt".
I've used this method in the bush after catching the track rod on a rock and bending it into a U.
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