Abstract: A hydraulic system has a frame member having an end. The structural member is pivotally coupled with the frame member end. A first hydraulic cylinder includes a cylinder housing, a ram with a head reciprocally disposed within the housing, a first chamber on one side of the head, and a second chamber on another side of the head. A first end of the first hydraulic cylinder is attached to the frame member. A preload spring has a first end which is attached to the frame member, and a second end which is attached to the second end of the first hydraulic cylinder. A second hydraulic cylinder is coupled between the frame member and the structural member. The second hydraulic cylinder includes a cylinder housing, a ram with a head reciprocally disposed within the housing, a first chamber on one side of the head and a second chamber on another side of the head. A first fluid line interconnects the first chamber of the first and second hydraulic cylinders.