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Getting the shank size right is what makes a weight distribution setup work correctly, and this 12" shank is built specifically for Equal-i-zer's no-shank hitch systems. It gives you a 12-inch drop or, flipped, a 15-inch rise, so you can match your truck-and-trailer combination and keep everything level.
Choosing the correct shank keeps your rig level, protects your tires and equipment, and lets the sway control system perform the way it's designed to.