Abstract: A heavy equipment system is provided that includes a tractor for hauling a trailer, wherein the trailer may have its height adjusted by a hydraulic system controlled by a bank of control levers. Also included is a safety system that comprises a blocking member, such as a handle, a sensor and a communication system. The safety system operates to sense and communicate to a driver of the tractor the possibility that the trailer is in the raised position by sensing when the blocking member is in a position to allow access to the control levers. Advantageously, such a system can guard against a driver driving into a low overpass or other hazard with the trailer in an elevated position.