Machine description: NATIONAL, 27 TON CRANE TRUCK, SERIES 1100 BOOM, MID MOUNT BOOM, BOOM SERIAL NUMBER 29740, BOOM HEIGHT 95', BLOCK, ANTI-TWO BLOCK, TRI-AXLE CHASSIS, MACK, EATON FULLER, 8 SPEED, SPRING SUSPENSION, 282 ... more info about the 1999 Mack RD688S.