One could argue, Technically a detachable trailer, not rigidly mounted to the car. Two really. So you would license each side. A trailer with a ridged hitch and a single swivel wheel is under the same rules.Would we need special licencing for a 5-wheeler?
So long as you can get a license plate (or two) in any state, you are good to go.
Actual sidecars (for people) are rigidly mounted to a motorcycle.
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