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Hook Locks For Trucks, Vans and Skip-Loaders The Crosby Group has a large range of hook locks for vans, trucks and skip-loaders. We have self-locking clevis hooks that prevent pinching, ball-bearing swing hooks that provide greater side stability and weight reduction, and galvanized hooks that resist corrosion. A combination of an algorithm for numerical continuation as well as bifurcation theory was employed to study the performance of the hook lock mechanism. Nine state variables