Silverback Marine has completed seatrials and commissioning of the OX series, twin Z-Drive equipped truckable tug earlier this month.The concept was designed to fulfill the vision of a truly tow-capable, tractor tug style vessel to the non subchapter M market. Traditional truckable tugs, driven by prop and rudder, are suited strictly for pushing, with limited maneuverability. The OX tug however, introduces a 25 x16 hull form with true tractor-tug lines, enabling the Schottel Z Drive propulsion package to deliver a whopping 14…