SL-4 Traxus Cargo Transporter
From Halopedia, the Halo wiki
The SL line, along with the SL-4, was designed to be smaller and inexpensive compared its standard "S" brethren.
The SL-4 is either modifiable or is sold in a variety of forms. Versions seen of the SL-4 include one with a protective cage for the driver, one without, and one without the actual forklift assemblage.
By the Battle of Tribute, the Casbah Port Authority were using the SL-4s. Other users 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.
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