Tow plow. 2:51 video:
https://www.youtube.com/watch?v=YJEgkbq_b2Q
Previously:
https://www.homemadetools.net/forum/...3007#post77257
https://www.homemadetools.net/forum/...4804#post80611
https://www.homemadetools.net/forum/...5715#post82392
https://www.homemadetools.net/forum/...397#post107280