It certainly is in the odd category, any idea what it would have been used for ?, not just transporting the D2 I think.

What's the purpose of the D2 truck? It doesn't look like it has any ground-engaging tools. Is it literally just a truck?
And my cousin's Twenty-Two that I look after has a winder like a grader hitch control over the hood that turns a windlass to raise the dozer blade. Quite a well-made system but the raising is from the front of the radiator top tank which is not ideal. Still, doesn't look like the radiator has suffered any damage in the decades that this contraption has been mounted. I'll see if I can get a photo when I get there.