The present invention includes a portable alley way having openings at one end. A collapsible crowding tub is connected to the alley way and includes an opening communicating with the opening of the alley way. The collapsible crowding tub includes a plurality of curved panels which are connected together in a substantially semi-circular pattern surrounding a fifth wheel hitch. An end curved panel is connected to the alley way adjacent the opening of the alley way. An extension panel has one end connected to the alley way on the opposite side of the opening of the alley way and has a second end connected to the fifth wheel gooseneck. A gate has one end pivotably attached to the fifth wheel gooseneck and is sized to swing in an arc within the semi-circular pattern of the curved panels. A latch is provided for latching the gate to a selected curved panel.