Abstract: In a preferred embodiment, in the line of suspension of a snow plow when suspended during transit of a motor vehicle having the plow mounted typically on the front frame and bumper thereof, a shock attenuating device typically inclusive of a helical spring arranged to be compressed responsive to intermittent increased stress results from downward surges of the large mass of the snow plow and/or upward movement of the vehicle resulting from vehicular movement over bumps or other rough terrain, with the shock attenuating device being operatively connected in series with between upper and lower chains, the upper chain having its upper end connected to a vehicularly-mounted chain-retraction and extension mechanism for alternately lowering and raising the snow plow to plowing position and raising the snow plow to a transporting position, and the lower chain at its lower end(s) being connected supportably to the snow plow.