I am planting to twin row inner one raised bed. Is it possible to positioning the diging not into the center to the ridge? Because in this way we can make a "U" turn at the end of the row and while walking back we can planting to the opposite side of the ridge. Can you please share information about it? Is it possible to buy it in Europe through a distributor or need to order it directly from Japan? Can you also share with me information about the speed adjustment and efficieny datas? Thank you in advance for your feedback!