[classicauto]

If you look at the cam bolt holding the outer arm of the rear trailing arm, that's where the AWR bearings would go.

As you can imagine, the "wish bone" trailing armspivot on both the cam'd bolt point, and the point where the adjustable links go. When you put the adjustable links up or down, you're twisting the other joint. At a certain point, that joint will bind because it wasn't meant to turn in such a way. The spherical bearings allow it to do so.

That said, I run the individual adjusters on my car, and dial'd out quite a bit of the camber, just enough so the outer joint still works smoothly. Any more and I'd need the AWR bearings.