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There are hundreds of uses for wheel chocks; everything from trucks to military aircraft to rail cars. Wheel Chocks prevent accidental movement or slippage of heavy vehicles. This is especially important during loading and unloading--the shifting weight can affect wheel placement unless chocks are used to stabilize the vehicle.
Use chocks along with truck restraints in dock areas for an added safety measure. There are many different sizes and materials to choose from--you may wish to use the rubber chocks when dealing with certain conditions--especially cold or wet areas, or the aluminum chocks in other situations including an indoor garage or warehouse situation where cold temperatures are not an issue.