WordNet sense 1 (someone who takes more time than necessary; someone who lags behind):

dawdler, drone, laggard, poke, lagger

WordNet sense 2 (an advertisement consisting of short scenes from a motion picture that will appear in the near future):

preview, prevue

WordNet sense 3 (a wheeled vehicle that can be pulled by a car or truck and is equipped for occupancy):

house trailer