Tanker 35 responded to a purported tractor trailer fire today. Chief 35 arrived on scene and reported a tri-axle dump truck with heavy fire in the cab, with no occupants inside. The responding crews pulled two attack lines. One was used for cooling the fuel tanks, and the other for fire extinguishment. Huntingdon Tanker 3 responded per 35's request, and staged in the event more water was needed. Unit 15 and 35 Fire Police also assisted on scene.