I think it makes a huge difference in winter conditions. I am not so sure that it does anything to cut down on the draft force required to move a load on bare or soft ground, however it does keep the butt end of your log from catching every root, stump and stone between the stump and landing. I think avoiding all those sudden stops helps team morale.
If building a new one I would try and bend the runners up rather then weld an angle. Also I really like the V on the front, it deflects off trees rather then hanging up. My good friend welded it up for me. He said the steel was $250 and if he charged me labor it would be $1,000.

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