Yes, with just the one attachment point it is definitely light weight and no you wouldn't want anything but a smooth roadway. I do like the way it hitches, though, as it allows the trailer to pivot and it gives a way of attaching it at the front. What I'm thinking is to use the attachment arm from a rear trailer (the kind which attaches at the rear axle) fixed to the trailer so that it is no longer coming off the front, but is reversed and attaches to the trailer further back. It would become the rear anchor while the front could use the basic idea from the Chariot side car. It would have then two attachment points, each of which could easily release the sidecar when you weren't using it. The front one would have to connect to the sidecar itself in such a way that the distance between the front anchor and the sidecar frame was adjustable so that you could get it parallel. Each attachment point would allow for pivoting so turning the bike left and right shouldn't be a great problem. I'm going to give it some more thought. Also with two anchor points I would think the carrying capacity could increase a bit. On my instep trailers it is a hundred pounds. Any more than that and I would think something like Steve's would be needed. And of course I'm talking about just a sidecar and not a sidecar pusher. What do you think?
SB