I thought that highway stability was primarily a function of alignment, e.g. for hands off tracking you'd want as much caster as you could get and a touch of toe in. I also find it odd that scrub radius seems to be pretty much ignored but then again i used to drive a 944 and that car tracked fine (but i may have a warped perspective as one of the vehicles i learned to drive on was an old IH Scout with a tiny steering wheel and super sloppy steering box...)
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