You can get the alignment you want with out stepper motors which add costs , weight and complexity not to mention trying to sell a car fitted with them.
Complianced bushings do all that you need and keep the geometry where it should be.
Have a look at the "Weissach axle" from Porsche for an example.
I agree with TJTS1...do more reading about suspension geometry first and especially the forces involved.
Pete.
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