I have to disagree with the previous comments. I have a plow just as you describe and it is semi-mounted. It will work very nicely with a snap coupler hitch. If it is a four bottom plow, the biggest question is will the 45 pull it when it is in the ground.
There are TWO wheels. One is a gauge wheel and it is next to the last bottom and rides on the land side. The steerable wheel in the rear has a linkage to the front of the plow. This design was done when the plows got to be large. Turning problems caused the land area at the ends of the field to get bigger and bigger. In about 1961, almost all major companies came out with steerable semi-mounted plows which allowed the lands to become much smaller again. My plow is like this and it works just fine. I don't know what year my plow is but I would guess it is about 1965.