Look at the cars in my photo album and my avatar. Those are not theoretical, and they did not build themselves. There are plenty more where they came from.
What I am trying to do on these forums is to present a very complex subject in a way that is informative but not too heavy. If that is all you got out of my comments regarding leaf spring bushings and suspension binding, then you missed the point completely. If that is because I didn't explain it well, then my bad, if it is because you just didn't understand it, well...I tried.
Have a good day.