9 on-board weight measuring systems for vehicles, said systems being comprised of scales, loadcells, sensors, transducers, hyraulic fluid valves, fluid conduits, electrical wiring and connectors, proximity switches, data collection transmission and collection devices, and software computer programs for receiving, monitoring, collecting, storing, analyzing and transmitting weight and vehicle activity data; electrical controls and control panels for the operation of load-lifting apparatus and weight measuring apparatus of load-carrying vehicles