<<<I'm trying to figure out if I can tow my 73 Thing.>>>

The only problem here that I can see is what do you do when you want to
stop this rig?

Like in a hurry?

I can feel the butterflies in my gut right now, mashing on the pedal at
a quicked changed stoplight and the Thing and the Van blowing right
through on the red.

This would be my only concern.