Towing the trike behind the trailer: an interesting problem. I'd build a three-rail platform, hinged to the rear of the trailer in such a way that it could hinge up and down but not horizontally, with a swiveling wheel aft to support it. If it can't swing horizontally where it attaches to the trailer, it won't require a special license endorsement for towing double trailers since it can't jackknife. Fairly easy to build with even a small welder.
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-- Carl
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