Our stone boat was used to pick stones off the field. In the North West corner of Ohio the ground has many stones from the size of your fist to the size of a car. When I was a kid dad hires a fellow to dynamite the big stones into smaller pieces which were rolled onto a stone boat to be removed to gullies, edge of a woods, along cattle lanes or put in piles around trees in the field. We would roll the larger stones plowed up onto a stone boat and after the field was fit and ready for a final sprint tooth drag we would pull the stone boat around the field and pick the smaller stones. When the larger hoes came to our area Dad had the piles buried and mechanical stone pickers were used to reduce the stone population in the fields. Areas in South Central Michigan fell into this stone problem as well where stone boats were used for picking stones. Much easier to load stones on a stone boat than to pick them up to trailer height. I built one last fall for my use with my miniature horse team to pick small stone off my worked ground.