http://www.ritehite.com/products/vehicle-restraints/rotating-hook/

For years one of the most dangerous work areas has been the loading dock. So there are plenty of chances for accidents. Studies show that dangerous spot is the area where the trailer meets the dock. If the trailer is not solidly secured to the dock and separation occurs for any reason, the forklift driver can fall into the gap suffering serious injury or death. Inside the dock, easy to understand lights change from red to green, helping dock workers and truckers know when the truck is secure and when it is safe for forklifts to proceed.
Outside the dock the truck driver sees a red light and warning signs indicating he should not attempt to move the trailer.

So make the smart safety investment for your company, prevent costly accidents and protect your personnel with Dok-Lok restraints from Rite-Hite.
http://www.ritehite.com/products/vehicle-restraints/