I've done a fair amount of what I call 'flat towing' using a towbar. Most recently towing my boy's Suzuki Samurai with my SMB, over 1500 miles, using a Harbor Freight 'universal tow bar' that I custom fitted to the Sammi's home-made winch bumper.
Having towed many, many VW's behind trucks and such over the last 30+ years, I had one very expensive mishap, that crushed a fender on a freshly painted 1955 Beetle I was restoring
There were several causes, my Nissan hardbody truck had a cabover camper that hung 18" past the tailgate being the biggest culprit. Before leaving the house, I knew I was not supposed to make tight turns, so I learned that the loose nut behind the wheel can not always be trusted to remember. In the end, what I should have done
was to extend the towbar, which would have cured the problem. Which I did about a month later, after the damage was already done. Come to think of it, I crushed the front of my old enclosed car trailer on the corner jack of my old 11-1/2' Lance cabover, about 10 years after that. Some of us never learn
The point is, if your towbar is too short to allow clearing your 40 during tight turns, you will likely forget, pull into some gas station while all tired, road-worn and blurry-eyed, then crunch $$$. I'd get a different tow bar, or make a longer custom one.