A Toyota freind of mine told me of these "Hyper Shackles" that allow your axles much more travel. There's sort of a link in the middle of it that allows it to jackknife closed upon itself and work as a normal shackle on the road. When you are offroad, they allow the axles much more travel by jackknifing open when your wheel needs to drop. At least that's sort of the way I understand it. Anyways, has anyone ever seen these used on Jeeps, specifically a YJ?