I'm sure it has been tried, but how well has it worked? I want to make some ladder bars to prevent axle wrap but I don't want the binding associated with them. What if I use a shackle from the rear of a rear spring and put it in the front spring hanger (of the rear spring) to allow the axle to follow the arc of the ladder bars? So basically it would have a shackle at all four corners on the rear springs. It's for a mud truck, and occasionlly will be used for truck pulls - articulation is not a huge concern.