[maple_leaf_eh]

Instead of trying to visualize a complicated set of angles and clearances, why not weld a few 90-degree tabs onto some telescoping tubes that have offset thru pins? This way if the BV's attachment point works best with the tab face up, or left or right, a telescoping joint in the middle can be swivelled 90-degrees or 180-degrees as required. Put in a cross pin or bolt. Give yourself a ring or whatever the towing vehicle's hitch needs, and proceed with due care. Check the chains every mile or so, and before any exciting parts of the route.

The objective is to put enough hours into the job back at the shop to limp the BV out of harm's way and closer to a better tow rig.