http://www.ritehite.com/products/levelers/smooth-transition-dok-system/
Dock shock is the constant jolting and jarring caused by a forklift crossing over the bumps and gaps on a traditional dock leveler. It results in exposure to whole-body vibration. And that can cause or accelerate back and neck injuries for your forklift operators.

Trailers that aren’t properly secured to the dock can also move horizontally Which increases the chance for a catastrophic accident. Trailer separation accidents such as trailer creep, unscheduled departure, landing gear collapse, and trailer pop-up or tip over – are serious safety concerns on the loading dock. They can result in severe injuries, even death.
For more information about dock levelers visit
http://www.ritehite.com/products/levelers