Hi, Folks.
I once coupled up two 14 disc one way disc plows by simply hitching the rear one to the back end of the front one. I did have to move the draught point of the front one toward the land side of the plow to counter the extra load on the rear of that unit but the system worked like a dream and was lighter to pull than a beam hitch for the same job.

I built a hitch point on the rear of the front plow with a rack of 5 holes to hitch the rear plow to.

Just my 0.02.