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Hook Locks For Trucks, Vans and Skip-Loaders The Crosby Group has a large assortment of hook locks for vans, trucks, and skip-loaders. We offer self-locking clevis clevis hooks that prevent pinching, ball-bearing swing hooks that provide greater side stability and weight reduction, and galvanized hooks that resist corrosion. The performance of the hook-lock mechanism was examined by combining an algorithm for numerical continuance and bifurcation theories. Nine state variabl