Tatra Vectra Motors Ltd. Offers Dumper with 20 Ton Payload Capacity. Tatra Vectra Motors Ltd. Also supplies tractors. Dumper with 20 Ton Payload Capacity is available with Rear tandem axle drive with lockable axle and interaxle differentials. It has air cooled, turbocharged Engine. It comes with pneumatic, air released, spring applied Parking Brake. The Dumper is available with 10 forward and 2 reverse gear box, synchromesh with one speed transfer gear box.