multi wheeled unicycles

With this recent discussion on multi wheeled unicycles, I am
inclined to ask:

Where would people recommend going for a decent two wheeler? I’ve got a
sem XL, and could go with the extention – have others experienced
problems with this? Besides sem, what sort of cost would be expected?

Jeff Lutkus

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I’d like to add a question along these lines. The multi-wheel fork
extension design as for the Semcycle probably has a time-tested and
proven track record but is there a limit on it’s durability? It
seems that there would be quite a bit of stress on the connection at
times. Any insight?
Thanks, Bruce