Abstract: A method for constructing a lower section of a sawmill carriage assembly comprises holding structural components between a pair of metal plates, and affixing the plates and the structural components together. The structural components may include wheels that guide the sawhead in linear movement along a track on a sawmill bed, to which the carriage base is attached. The structural components may also include a track cleaning system disposed between the metal plates. The track cleaning system maintains optimal track conditions.

Abstract: A trailer includes a chassis having a hitch, an axle having a pair of tractive elements rotatably coupled to the chassis, an actuator coupled to the chassis and positioned to steer the pair of tractive elements, and a processing circuit. The processing circuit has an input for receiving a transmission gear of a tractor vehicle and a variable output for engaging the actuator. The processing circuit is configured to control the steering of the pair of tractive elements according to a control strategy that varies based on the transmission gear of the tractor vehicle.