Among the newest Vermeer trencher/plow models are the RT450 and RT650, both hydrostatically driven, ride-on units. The RT450 uses a 50-hp Deutz engine and can trench to 60 inches deep and from 5 to 12 inches wide. The larger RT650 has a 76-hp Deutz engine and is capable of trenching to depths of 60 inches and to widths of 16 inches. Both models feature a radial-piston trencher motor for enhanced efficiency. Estimated list prices: $30,000 to $70,000.