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Hook Locks For Trucks, Vans and Skip-Loaders The Crosby Group has a large range of hook locks for trucks, vans, and skip-loaders. We offer self-locking clevis clevis hooks that prevent pinching, ball-bearing swing hooks for increased side stability and weight reduction, and galvanized hooks that resist corrosion. A combination of an algorithm for numerical continuation and bifurcation theory were used to evaluate the performance of the hook lock mechanism. Nine state variables were determined. Selecting a Hook and E