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Hook Locks For Trucks, Vans and Skip-Loaders The Crosby Group offers a wide range of hook locks for vans, trucks and skip-loaders. We have self-locking clevis hooks to prevent pinching; ball-bearing swivel hooks for improved side stability and reduced weight and galvanized hooks that protect against corrosion. A combination of an algorithm for numerical continuation as well as bifurcation theory was used to evaluate the performance of the hook lock mechanism. Nine state variables were analyzed. Selecting