I just ordered one of these leaf spring accessories and wondered if anybody has used them.
Apparently it is like the old kicker shock but works much better in reducing axle wrap, wheel hop and sway. It looks like a beefy, variable rated coil spring that bolts to the top of your leaf springs from the axle to the rear end of the spring - effectively controlling axle wrap etc, without stiffening the ride.
Sounds like a great add-on. The URL is activesuspension.com