The SL-4 Traxus Cargo Transporter is a civilian vehicle manufactured by Traxus Heavy Industries.
The SL-4 was first introduced prior to the summer of 2552. By the Battle of Tribute, the Casbah Port Authority had acquired several of the SL-4s.
Following the war, Traxus saw even greater success with the vehicle. Companies of varying size, and even governments were purchasing it. Examples include the City of Pilvros, for their city's reactor, and the Liang-Dortmund Corporation for their operations on Meridian. The UNSC even purchased a few for use on the UNSC Infinity.
The SL line, along with the SL-4, was designed to be smaller and inexpensive compared its standard "S" brethern.
The SL-4 is also modifiable. One version of the SL-4 features a protective cage for the driver, one without, and one without the actual forklift assemblage.
The SL-4 acts as a scenery item in each of its gameplay incarnations. In Halo 5: Guardians and on the Halo 4 map Landfall, it is a Forge object. In Halo 5, its colours can be modified.