The Serco SMWC Series manual Safety-Chock wheel restraint is a cost-effective and easy-to-operate solution for restraining unconventional trailers. The safety-chock is mounted above ground, is easy to install and requires minimal maintenance, creating a lower lifetime cost of ownership than other wheel chock systems. This restraint requires only 35 lbs. of operating force to engage or disengage and no bending or lifting for safe and accurate operation. Standard design features include an interlock-capable control panel, standard LED communication lights, exterior audible alarm and advanced safe engagement sensors to provide effective and efficient communication between the dock worker and the restraint operator.