I saw this rig at a Canada Day event. Looks almost like a recumbent. I wonder how it rides.
The attachment system looks like it would suffer from the same problems as the Trail-a-bike we use. I find it a little hard to control the bike moving at slower speeds. As my stokid gets more confident on the back, he seems to want to shift around more and more, making it tough to steer. He’s also a speed demon, and always wants to pedal down the hills when I want to either coast or use the brakes to modulate our speed!