DESCRIPTION 1978 Mack Dry Truck (DR9721 Unit 230), Mack diesel engine, 2 stick Mack transmission, tandem axle full screw, Mack rears, Willmar LoadRunner 10 stainless steel hydraulic dry tender box, rear discharge auger, flip tarp, 10.00/R20 tires, odometer reads 545,753 miles. Serial Number: R686ST21475 Notes: