DESCRIPTION 1986 Mack RD686 Truck (DR12623 Unit 111), Mack diesel engine, 10 speed transmission, tandem axle full screw, air lift tag axle, 228'' WB, double framed, dual polished aluminum fuel tanks, 24.5 tires, aluminum wheels, odometer reads 707,775 miles. Serial Number: 1M2P137C1GA014230 Notes: