Abstract: A trailer can include an open bed, a frame, an actuator, and a pin. The open bed can extend a width and a length. The frame can support the open bed. The actuator can be mounted on the frame. The pin can be mounted on the frame along a periphery of the open bed. The pin can be drivable by the actuator in reciprocating movement transverse to the length between a first pin end limit of travel defining a refracted position and a second pin end limit of travel defining an extended position. The pin can be recessed from the open bed when in the retracted position and extend above the open bed when in the extended position.