KDSS is an onroad system. It allows the 4Runner to have larger sway bars than the standard model without those swaybars negatively affecting articulation. I think that with the suspension travel that the Pro supposedly gains, the KDSS caused more problems off-road than advantages onroad so they decided to pitch it out on the Pro model.
Yes, yes could not have said it better. Which is why it was never offered on the FJ. And I ordered mine without it.
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