U-bolt eliminator, takes different loads off the springs, adjustable pinion angle, eliminates axle rap.
Today guys are running much bigger tires, and horsepower and yes, they will break a couple of the main leaves just in front of the Axle, or they break all three right behind the front bushing eye and in some cases the front bushing I will totally enlarge want to tear away from the mount.
I am still in the early stages of developing and have not mounted on a vehicle yet and waiting on some other parts before I mount the first one.