I've got a fresno my dad and his twin brother used to build a pond and dam with when they were about 15 years old. It was during the 30's when the family needed cash money and my grandfather got a pretty good government check for it($100). It was built by Russell Grader Co and has a 48" cutting edge. They pulled it with a team.
When I'd ask my dad about the type horses they used he say they were just horses (not draft). Can a big single draft load something like that or is it too wide?
Everyone I knew who actually worked horses like that is gone now. I've run searches on the forum and I know there is a couple men who used equipment like this. I'm hoping one of them or anyone who might know will respond.
I don't intend to use it myself. Even if my knees weren't worn out, I can imagine hitting a caliche rock and getting sent into orbit.