[Russ Noble]

Russell,

That's true so long as the bottom parallel links are the same length and parallel in end elevation. As soon as you alter the caster you will have one pointing down relative to the other and hence will still get a degree of bump steer. So by altering caster you can get either no bumpsteer, or toein, or toeout, on bump depending on what you want.

If you wish it should be possible to completely tune out bumpsteer with twin links. That is certainly not the case with a reversed lower A arm, although it can be minimised with the right caster setting.

Cheers,