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Hook Locks For Trucks, Vans and Skip-Loaders The Crosby Group has a large selection of hook locks available for trucks, vans, and skip-loaders. We offer clevis self-locking hooks to prevent pinching; ball-bearing hooks that swivel for better side stability and less weight and galvanized hooks to protect against corrosion. A combination of a numerical continuation algorithm and bifurcation theory were used to analyze the performance of the hook lock mechanism. Nine state varia