My cousins had a couple trailbreakers back in the mid 60s. My Uncle bought them as tools to be used in the potato fields when running the irrigation lines. they could pull a fair sized little cart behind them loaded with the 2" curved irrigation pipes. Prior to getting the bikes we all had to pull the carts and move the pipes by hand. So it was safe to say that the trailbreakers were not to be used as pleasure toys. I don't know when the company became Rokon probably sometime in the 70's
I agree with IAMSatisfied on parts and reliability here in the States but in Europe or Asia I would have to go with the Russian version