trailer

(noun) someone who takes more time than necessary; someone who lags behind. Synonyms: dawdler, drone, laggard, lagger, poke.

(noun) an advertisement consisting of short scenes from a motion picture that will appear in the near future. Synonyms: preview, prevue.

(noun) a large transport conveyance designed to be pulled by a truck or tractor.

(noun) a wheeled vehicle that can be pulled by a car or truck and is equipped for occupancy. Synonyms: house trailer.