Abstract: A trailer comprising an open top rectangular box member which is detachably attachable to a support assembly which is attachable to a motor vehicle so that the trailer can be towed. The support assembly comprises a support member mounted on two wheels, the open top box member being attached to the support member when the trailer is ready for use and detachable therefrom when the trailer is not in use. The support assembly is, when detached, locatable within the open top box member so that the support member at least substantially closes the open top of the box member to thus form a box-like structure which can be stored resting in any desired face.