These vehicle types serve different tasks. Selecting a category should begin with how the vehicle will be used, rather than with its appearance.
Dump trucks
A dump truck carries bulk material in its own tipping body. Discuss the material, site conditions, body requirements and unloading arrangements. Actual permissible loads depend on the vehicle and operating rules.
Tractor units
A tractor unit is intended to pull a compatible semi-trailer. Confirm coupling compatibility, drivetrain, route conditions and the trailer or load requirements.
Mining and wide-body applications
For mine or quarry work, discuss the site and duty cycle in detail. Confirm whether the offered vehicle is appropriate for the intended environment and whether public-road use is relevant.
Include your actual operating requirements in the sourcing request so that the proposed configuration can be assessed.