Plug-in components to expand input to vehicle position and movement tracking devices, vehicle telematics and engine data monitoring devices and driver monitoring and driver feedback devices, namely, modems, RFID driver identification tags, serial ports for interfacing to third party products, oil level sensors, oil condition sensors, coolant and fuel intrusion sensors, computer networking hardware for machine-to-machine communication, computer hardware for driver log and driver inspection reporting, electronic vehicle immobilization devices, electronic controls for salt spreading machines, satellite-aided navigation systems, mobile phones, wireless routers, and batteries; plug-in components to expand input to vehicle position and movement tracking devices and driver monitoring and feedback devices, namely, collision avoidance and traffic control systems comprised of back-up sensors, cameras, and sound alarms; plug-in components to expand input to vehicle telematics devices, namely, on-board weighing systems for trucks with spring, air, or mixed suspensions comprised of weighing scales and computer hardware