Here’s something that I don’t think has been mentioned yet. I feel a bit nervous mentioning it amongst some obviously experienced and knowledgable people, however I read it somewhere, either in Martin’s book or Puhn’s book, and it kinda stuck in my brain.

As the car leans thru a turn, a solid-rear-axle car (or is it a leaf-sprung car???) will actually experience some dynamics where the inside of the car experiences a shorter wheelbase as it rises, the outside of the car shows a longer wheelbase, so the rear axle starts to point slightly toward the outside of the turn. The rear axle ends up steering the opposite direction of the turn. A rear swaybar will help reduce that.

The more I think about it, a leaf-sprung car should theoretically exhibit that worse than a coil/trailing arm system because the change of arch in the leaves changes the length also.