Abstract: A generally horizontal forwardly opening U-shaped frame is provided including a pair of front to rear extending elongated opposite side members and a rear cross member extending and secured between the rear ends of the side members. The forward ends of the side members may be removably anchored to transversely spaced rear portions of a forward implement and an elongated front-to-rear extending draw bar is provided and pivot structure pivotally anchors the draw bar to the cross member for oscillation relative thereto about an upright axis disposed intermediate the opposite ends of said cross member and the front and rear ends of said draw bar.