It's that second tongue that makes it skip instead of swing out of line in turns. The power trailer for the bubba tracks better because it is on one arm and can swing. What I am hoping is that the drive wheel will be closer to the bike and won't have to move so far to right itself. The single wheel does pretty well on wide turns, its the close ones that give it a problem.
You are right about the side car type drive. I have seen those and I too wonder what it would do.I think it would be a lot like a trike, but that is just guess. I don't see how you could lean on it either. Except maybe to one side.
The motor and drive work just fine, it's the handling I am trying to improve a little. It does pretty good, I don't think it is dangerous. But it would take some getting used to for sure If I leave it the way it is now. I will try to keep the trailer as narrow as possible to make it more maneuverable. I still want the batteries on it to use the weight to hold it on the road.