Abstract: A wheeled dirt scraper having a pair of stabilizer rails pivotally mounted onto each of the side wings of the box, the rails being provided with damping devices to reduce, absorb and eliminate shock effects. The rails have a relatively large surface contact area and extend substantially the length of the wings. The rails are mounted such that the lower surfaces can pivot below or even with the bottom edges of the wings, so that the rails can remain in contact with the ground even when the wings are suspended above the ground.