Lectra Haul Unit Rig 143 had a gross empty weight of 223,276 pounds and a loaded gross weight of 563,276 pounds. It used a 16V149 Detroit engine rated at 1600 horsepower, had accumulated 30,000 hours of life to date, and consumed 20 gallons of fuel per hour. The average cost of its tires was $9,000, and the average cost of an engine rebuild was $35,000. In 1984, 143 was moved from Butte to the Black Thunder Mine.