"I really like Carlos' ball socket design though. It sure eliminates a lot of the difficulty of maneuvering the whole "weighty" mechanism into position with only one arm access"
@Carlos G idea/design is brilliant! With regard to maneuvering a weighty mechanism into place, here is how I maneuver my tow bar for attachment to my lowered Speedster.
Use two blocks of 2"x4" positioned to function as a fulcrum so that weight of front of tow bar raises rear portion up onto the torsion tubes. This enables me to simply reach in with one arm to insert pins (rear to front).