The more expensive, heavy-duty versions are motor-driven.
A heavy-duty version of the F-150 designed for more serious towing and hauling while maintaining a high degree of pampering.
New Zealand Government Railways, during the 1970s, developed an extremely large and heavy-duty version of the chopper coupler.
The Ford Sterling 9.75 axle was also optioned in heavy-duty versions.
It was a heavy-duty version of a civilian Sky Rover with four ground wheels instead of landing skids.
The more expensive, heavy-duty versions are motor-driven (usually by an electric motor).
The 500 through 700-series were medium duty only, while 900 and 1000 series were reserved for heavy-duty versions.
Motor Trend and Car and Driver, have earlier reported Toyota will produce a heavy-duty version of the Tundra designed to compete in the 3/4-ton class.
There was also a heavy-duty version designated BR2.
A heavy-duty version of ControlTrac was introduced in 1996 for the 1997 model year on the first generation Ford Expedition full-size sport utility vehicle.
