An autonomous device for loading and unloading trucks comprises a mobile body, a robot arm and a body conveyor system to convey cartons during loading and unloading. A manipulator attaches to a moveable end of the robot arm and is maneuverable within the tight confines of the truck. The manipulator picks up a row of articles at a first location and places the row of articles down at a second location. The manipulator is reconfigurable to match to both locations.