What you are describing is a Watts Link.
Used on Le Mans Tigers, and numerous other racing applications.
Described in Carroll Smiths' book "Tune To Win" in the section having to do
with lateral location.
In short, Mr. Smith does not think that the theoretical advantages of the
Watts Link over the Panhard Rod are worth the extra complexity.
The problem with the Tiger Panhard Rod is it's just too damn high.
The roll center is where the Panhard Rod intersects with the vehicle
centerline.
If you remove the Panhard Rod and reinforce the leaf springs, the roll center
is at the centerline of the beam axle and the vehicle centerline.
Bruce McGuire
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