1998, MACK DM688S ROLL-OFF TRUCK, 32900 Canadian Dollars.MACK DM688S TRUCK: 1998 Mack DM688S Roll-off Truck. Mack E7-350 Engine, 350 HP. Maxitorque T2090 Transmission. Inside Controls. Power Steering. A/C. Tandem Axle. Front Capacity: 18,000 lbs. Rear Capacity: 44,000 lbs. Camelback Suspension. Front Tires: 315/80R22.5 at 80%. Rear Tires: 315/80R22.5 at 90%. 60,000lb Hoist. Inside/Outside Rails. Pioneer Tarp System.