Designed as dedicated haul-and-dump vehicles, the 6-ton Terex site dumpers (models TA6 and TA6s) have a power train that combines a 74-horsepower Tier 4-Final JCB EcoMAX engine with hydrostatic drive. Payload capacity for both models is 13,229 pounds, and both models have a top speed of 16.3 mph. The forward-tip TA6 has a heaped capacity of 4.9 cubic yards, and the swivel-tip TA6s, which can rotate its skip to place loads at either side of the machine, has a heaper capacity pf 4.6 cubic yards.