1991 GMC, TOPKICK C8500, Heavy Duty Trucks - Tank Trucks - Water, CATERPILLAR 3116, Automatic, good running truck, PTO/PUMP, air operated controls, air seat, air brakes, double frame, differential lock!, 300 Horse Power, Walking Beam Suspension, Wheels, Wheel Base, 22.5, Axle, Ratio, , VIN 1GDT7H4J9MJ503905