An advertising display trailer for a bicycle, the trailer including a base, a coupling for coupling the base to the bicycle, and a display body mounted to the base is disclosed. The display body may be configured so as to pivot relative to the base. A display trailer including a base and a structure mounted to the base for carrying a display body such that the display body is able to pivot relative to the base. Also disclosed is a bicycle trailer for carrying an advertising sign, wherein the trailer has a base adapted to carry the advertising sign such that the sign extends generally upwardly from the base. In one form, a structure of the trailer is such that it is designed only to carry the advertising sign.