caravan [caravans](convoy or procession) noun [UK: ˈkæ.rə.væn] [US: ˈkæ.rə.ˌvæn]
trailer [trailers](unpowered wheeled vehicle that is towed behind another, and used to carry equipment, with the exception of a caravan) noun [UK: ˈtreɪ.lə(r)] [US: ˈtreɪ.lər]