I remember as a boy seeing the big crawlers working the marsh grounds around Alger and McGuffey Ohio .It was once a huge swamp and once drained was and still is some of the richest farm land in the USA .
Because of the loamy soils they used huge crawlers ,TD 25 IH's and D9 Cats pulling some of the largest offset discs you can imagine.They didn't move very fast but they took a big swath on each pass .
I also saw the largest plow I've ever seen in my life ,18 20" bottoms that was a type of semi mount with a wheel in the middle and a trail wheel on the end,huge,I mean huge .
That marsh was farmed in mile sections just like Kansas or some of the western states . The crawlers kind of went by the wayside once the large 4 wheel tractors came around .