Abstract: A stabilizer system for automatically leveling the dump body of a rear dumping vehicle. The system is adapted to be employed with a tractor-trailer rig including an elongated pivot dumping body associated with a trailer. First and second hydraulic rams coupled to the front of the dump body are employed to tilt and simultaneously level the trailer dump body during unloading. The lower ends of the hydraulic rams terminate in pressure plate apparatus adapted to contact the driven, rear wheeled axles of the tractor unit. The pressure plates include a plurality of rollers rotatably secured to the pressure plate which support the weight transmitted by the rams while permitting rotation of the tractor tires. An electrical-hydraulic system controlled by a pivoted pendulum appropriately actuates the rams for leveling the apparatus. Thus the entire unit may be manuevered by the tractor while unloading and tilting the dump body, simultaneously with the automatic leveling function.

Abstract: A stabilizer system for a rear dumping vehicle, which system includes an independently operable stabilizing member mounted on each side of the vehicle chassis. Each stabilizing member is urged downward by the ram of a hydraulic cylinder against the tires of the dump body. Hydraulic control is applied to each hydraulic cylinder through a hydraulic conduit which interconnects the respective cylinders with a source of hydraulic pressure. The hydraulic pressure is applied by opening an electrically actuated valve in each conduit. The valves are preferably controlled by limit switches which are actuated by pendulum means oriented to swing transversely of the vehicle chassis. In one arrangement, a manually operated switch operates the hydraulic valves in the conduits to actuate the rams of both cylinders, thereby substantially fixing the position of the chassis with respect to the wheeled rear axle.