For inland shipping, the investment to build a new ship with a Y-shape Hull carrying larger cargo tanks is lower than that of a conventional hull with standard-sized tanks. Enlarged cargo tanks means a reduced number of tanks in your ship. This means fewer pumps, connections, level indicators, etc., and a lower breakdown probability.
Not only will your ship be environmentally friendlier by sailing on LNG, it will become cheaper to sail. LNG costs less than diesel. Over time, this will lead to significant savings.