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