Trailer may refer to:
Transportation Trailer (vehicle), an unpowered vehicle pulled by a powered vehicle Baggage trailer, a large flatbed baggage trolley Bicycle trailer, a wheeled frame for hitching to a bicycle to tow cargo or passengers Boat trailer to carry small boats Horse trailer and other trailers designed to haul livestock Semi-trailer, a trailer without a front axle Travel trailer, or caravan, a type of recreational trailer designed to provide sleeping space Semi-trailer truck, the combination of a tractor unit and one or more semi-trailers
Shelter Mobile home, a relocatable housing unit with wheels and a hitch. Portable classroom, a temporary classroom for schools with insufficient building capacity - not technically a trailer due to lack of wheels or hitch. This temporary shelter can be relocated with a trailer, but by definition, the structure itself is not a trailer. Construction trailer, relocatable temporary accommodation with wheels and hitch used for offices and building materials storage on construction sites.
Computing Trailer (computing), data appended to a main block of data to facilitate its processing
Multimedia Trailer (promotion), an advertisement, usually in the form of a brief excerpt or string of excerpts, for media work Teaser trailer, a truncated version of a trailer meant to "tease" an upcoming work
Music Trailer (album), a 1994 album from the Northern Irish musical group Ash Tráiler, 2018 extended play by Spanish singer Aitana