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  2. Ballast tractor - Wikipedia

    en.wikipedia.org/wiki/Ballast_tractor

    The ballast box is a metal box installed on the rear chassis of the tractor instead of the fifth wheel coupling. Earlier heavy haulers unmounted the fifth wheel and used merely a piece or two of heavy rocks, stones or concrete blocks which weighted enough to avoid wheel spin, [4] later builders and heavy haulers developed metal boxes of ...

  3. Tractor unit - Wikipedia

    en.wikipedia.org/wiki/Tractor_unit

    Peterbilt 386 sleeper-cab–style commercial 6×4 tractor unit. A tractor unit, also known as a truck unit, lorry unit, power unit, prime mover, ten-wheeler, semi-tractor, semi-truck, semi-lorry, tractor cab, truck cab, lorry cab, big rig tractor, big rig truck or big rig lorry or simply a tractor, truck, lorry, semi, big rig or rig, is a characteristically heavy-duty towing engine that ...

  4. Nicolas Tractomas - Wikipedia

    en.wikipedia.org/wiki/Nicolas_Tractomas

    Nicolas Tractomas is a heavy-duty built-to-order ballast tractor specifically to tow hydraulic modular trailers and road trains used for movement of oversize loads manufactured by French manufacturer Nicolas Industrie based in Auxerre. The tractor was bespoke build with preferred engine, gearbox, drivetrain and ballast with a Renault Kerax cabin.

  5. Artillery tractor - Wikipedia

    en.wikipedia.org/wiki/Artillery_tractor

    Wheeled British WWII Scammell Pioneer towing an 8-inch howitzer Tracked Finnish WWII Komsomolets (captured from USSR) Half-tracked German Sd.Kfz. 7 towing an 8.8cm Flak. An artillery tractor, also referred to as a gun tractor, is a specialized heavy-duty form of tractor unit used to tow artillery pieces of varying weights and calibres.

  6. Dolly (trailer) - Wikipedia

    en.wikipedia.org/wiki/Dolly_(trailer)

    It is designed to couple to the concerned automobile's powered wheel, i.e. the front wheel of a Front-wheel drive automobile, or the rear wheel of a rear-wheel drive automobile, by locking the powered wheels onto the tow dolly's tray. The tow dolly is tow hitch connected to a tractor or truck. Tow dollies are legal in all 50 US states and Canada.

  7. Road train - Wikipedia

    en.wikipedia.org/wiki/Road_train

    A fifth wheel dolly is then affixed to the hitch allowing another standard trailer to be attached. Eleven-axle coal tipping sets carrying to Port Kembla, Australia are described as A-doubles. The set depicted has a tare weight of 35.5 t (39.1 short tons) and is capable of carrying 50 t (55.1 short tons) of coal. [41]

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