Editing Tractor unit

{{Status|Canon}}
{{Vehicle infobox
|image=[[File:HReach-UNSCTractorUnit.png|300px]]
|manufacturer=Various
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|role=Freight transport
|affiliation=[[Unified Earth Government]]
}}

A '''tractor unit''', '''traction unit''', '''road tractor''' or '''prime mover''' is a heavy-duty vehicle, usually with a powerful engine and several axles. The tractor unit serves as a method of moving trailers. Trailers can be swapped between tractor units quickly so the unit does not stand idle whilst the load is unloaded or loaded, unlike a rigid, and is not restricted to one type of goods as trailer types can be swapped e.g. Bulk tipper to a box van. The tractor-trailer combination also means that a load can be shared across many axles, yet be more maneuverable than a equivalently sized rigid truck. The tractor unit couples to the trailer using some sort of mechanical lock system, usually a fifth wheel. A tractor unit is primarily designated a freight vehicle and is most common in the heavy goods vehicle class of vehicles although smaller van based tractor units do exist.

A tractor unit was used a haul a trailer from an Insurrectionist bomb assembly factory to a diner on [[Tribute]]. The cabin was damaged as a round from a [[Model 99 Special Application Scoped Rifle]] punched through it, killing the driver. The trailer was later detonated by his accomplice, destroying the trailer, tractor unit, and diner, killing 38 civilians and three UNSC Marines.<ref>'''[[Halo: Contact Harvest]]'''</ref>

==Trivia==
*Tractor units appear in ''[[Halo 3]]'', both in the campaign missions set on Earth, and in Forge. The game uses them as scenery however, since they do not count as drivable vehicles. Each tractor unit costs $8, and only two can be placed per map.<ref>'''[[Halo 3]]'''</ref>
*Tractor units, sometimes linked to their trailers, appear as scenery objects in ''[[Halo Wars]]''.
*In ''[[Halo: Reach]]'', the [[HuCiv HC1500]] tractor unit is an available drivable vehicle on some campaign levels. It is prone to oversteer similar to other civilian vehicles in the game, and it goes about half the speed of a [[M274 Ultra-Light All-Terrain Vehicle|Mongoose]].
*The only [[multiplayer]] map in ''Halo 3'' to support it is [[Foundry]].
*Tractor units are not available in ''Halo: Reach'''s Forge mode on any maps, along with all civilian vehicles.

==Gallery==
<gallery>
File:H3 Concept TractorTrailer.jpg|Concept art of a tractor unit on [[Tsavo Highway]] in ''Halo 3''.
File:David-stammel-reach-truck.jpg|Render of the UNSC military tractor.
File:UNSC tractor unit.jpg|An olive drab UNSC military tractor unit on Reach.
File:H3Truck.jpg|A UNSC tractor unit in [[Crow's Nest]] on Earth.
File:Halo Reach - Truck 03.jpg|An HC1500 tractor unit on Reach.
File:NEUTRAL Arcadia Transit.jpg|Concept art of a truck for ''Halo Wars''.
File:H4-TractorTrailerTruck.png|A tractor trailer unit in ''Halo 4''.
File:H4-Perdition-02.jpg|A tractor trailer unit in the ''Halo 4'' map [[Perdition]].
File:H4SO UtilityTractor Concept.jpg|Seemingly-unused ''[[Spartan Ops]]'' concept art depicting a "utility tractor".
File:H4SO_Generator_Concept.jpg|Concept art of a generator trailer to go with the prior image.
</gallery>

==List of appearances==
*''[[Halo 2]]'' {{1st}}
*''[[Halo: Ghosts of Onyx]]''
*''[[Halo 3]]''
*''[[Halo: Contact Harvest]]''
*''[[Halo Wars]]''
*''[[Halo: Blood Line]]''
*''[[Halo: Reach]]''
*''[[Halo 4]]''
*''[[Halo 2: Anniversary]]''
*''[[Halo Infinite]]''

==Sources==
{{Ref/Sources}}

{{Human civilian vehicles}}
[[Category:Civilian vehicles]]