The self-operating cargo transport designated 1-138 was responsible for the conveyance of cortosis from Cloud City to the Imperial Cairn Installation during the short time the city was under the control of the Empire Reborn. Following Tavion Axmis's loss to Kyle Katarn at the Battle of Cloud City, Katarn secretly boarded the 1-138, which then transported him to the Cairn Installation.
The hauler's designation is mentioned in conversation during a cinematic sequence.
The designation 1-138 serves as an allusion to THX 1138, the initial motion picture by George Lucas; numerous similar allusions exist within Star Wars media.