1) Had you considered adding a couple of eyes - one on each side - to allow a "V" towbar which might obviate the need for someone to be in the towed i-MiEV?
Recall that I configured the tow bar to pick up a new car at a dealer about 150 miles from me. I didn't want anything that would require ANY car modification.
Yes, if I wanted to tow regularly, with one driver, a car in my possession, I would have developed some other solution.
2) Did you have any issues with ground clearance or the bar coming up too high when the towing vehicle went over a bump?
Not at all. I was somewhat surprised. One of the photos is of the hooked up pair of cars at a convenience store; to exit, we had a little dip from the parking lot on to the highway. No problem there. Incidentally, that was more than a "convenience store". It is a Kolache Mecca:http://www.hruskas-bakery.com/
An intended and anticipated stop on the route.
Other than that kolache stop, the entire towing route was a major highway, SH71.