Sumner, most sidecar hub-steering uses A-Arms
so Wille is right about it putting it on one side.
Think of it...........taking one corner off a car and fabricating it to a center frame.......However, there is a lot more involved.......one probem with sidecar hub-steering that you do not have in solo-bike hub-steering, is what we call bump- steering................. it gets rather complicated......
Any one interested in fabricating hub- steering for a sidecar feel free to contact me.....glad to help...........we have no secrets..................................
Glad you are doing well,, Willie...and Happy Holidays to you and yours........................................