Abstract: A stabilizer device for use on the leading end of a trailer includes a turntable with a fixed base, pivot plate rotatably mounted on the base, a pair of hydraulic cylinders pivotally connected to each other and to one side of the pivot plate at one end, piston rods extending outwardly from the other ends of the cylinders to opposite sides of the turntable, the outer ends of the piston rods being pivotally connected to a fixed portion of the trailer, a first tube extending between first ends of the cylinders, a second tube extending between the other ends of the cylinders so that the cylinders and tubes form a closed circuit, and a control system in one of the tubes. The control system includes a pair of lines inserted into the tube, a first fixed orifice element in one of the lines, a solenoid valve in the same one line, a speed monitor attached to the valve, and a second smaller fixed orifice element in the other line.