Articulated haulers excel in hauling material over rough terrain e.g. swamps, bogs, marshes. They are rugged and are built to handle great inclines and slippery conditions. This is their main advantage over rigid haulers, which excel in carrying capacity. Where an articulated hauler can take no more than 55 metric tonnes there are models of rigid haulers (haulers with conventional front steering and rear-wheel drive) that can carry up to 310 tonnes such as the Belaz 7550. The model 7550, produced for five years, was actually a prototype while the EH 5000, has a payload capacity of 326 tonnes, which is one tonne shy of the Komatsu 960E-1.