This is a nice Japanese picture if it helps.
https://ja.wikipedia.org/wiki/サイドカー#/media/File:Three-wheeled-bike.jpg
https://ja.wikipedia.org/wiki/サイドカー#/media/File:Three-wheeled-bike.jpg
Why not use a trailer instead?Thanks for a lot of information. I am retired, and now disabled and use a walker to get around. I came to this forum to try to find ideas for a sidecar for carrying a walker. Now I will have to digest this info and see what I can do with it.