Dually pickup trucks ... commonly rear-wheel-drive trucks, as 4X4 drivetrains cut down on tow capacity. For clarification's sake: While many duallys fit into the one-ton Heavy Duty (HD) category ...

Hardcore suspension setups and heavy-duty transmissions are often standard, and the truly big brutes often require an extra set of wheels in the back - 1-ton dually trucks, such as the Ford F-450 ...