The patented Serco POSI-TRAC® hold-down offers an extended float range throughout the leveler’s working range and provides easy fingertip release. This is accomplished with an exclusive brake band and a 32-tooth spur gear assembly that replaces maintenance-intensive conventional hold-downs. It eliminates “bouncing” from float spring fatigue. The lip maintains level contact with the truck bed, even with air-ride suspension trailers. In below-dock operations, the POSI-TRAC®’s hold-down compensates to counteract the main spring counterbalance of the leveler.