This is a bit off of the original topic but . . .

Also important is the 4-links relation to the cars center of gravity.
The bar angle should converge near the vehicle's center of gravity.
If its too far back = wheelstands = wasted energy.
If its too far forward = inadequate rear wheel loading = tire spin.

Which introduces a curious problem to solve.
Center of balance (vertical axis) is easily found by balancing your car on two jack stands.
How would one find the true center of gravity ie horizontal axis?

I suppose most just use the center of balance at the frame as their reference point.

Bert