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Hook Locks For Trucks, Vans and Skip-Loaders The Crosby Group offers a wide selection of hook locks for vans, trucks and skip-loaders. We have self-locking clevis hooks to avoid pinching; ball bearing hooks that swivel for better side stability and lighter weight; and galvanized hooks to keep out corrosion. A combination of a numerical continuation algorithm and bifurcation theory were used to study the performance of the hook lock mechanism. Nine state variables were determined. Pick a Hook and an