And for those of you playing along at home, here is a picture link of the exact plow that is the basis for my model. A Don Vaughn Collection Photo of the X 38 being delivered NEW at Oelwein Iowa in 1938. The temporary ladder on the front nose of the plow was a thing required by regulation for shipping the plow, and was promptly removed before the plow entered service.
http://www.irm.org/gallery/album337/aai
For a closer view of the front coupler and its massive casting try this link.
http://www.irm.org/gallery/album91/azk
Bob Kutella