The XA66 amphibious vehicle is the only non-tracked Hydratrek®, but it is very versatile and smooth riding. This vehicle is powered by a 44 HP turbo-charged Kubota diesel engine (V1505T). Like every Hydratrek® model, it is constructed from marine-grade aluminum and operates via a closed-loop hydrostatic drive system. The XA66 is outfitted with six aggressive ATV tires, and each one is driven by a hydraulic drive motor.