This is a device where one component is a member which, without recourse to any tools, can be attached to or removed from a tow-ball that is anchored to or integral with a tow-bar. The member is rigidly located and unable to move in any plane or about any axis when it is engaged with the tow-ball and the remainder of the device. The member has an integral platform that can be used to support and or tow any desired object e.g. bicycles on a rack attached to the platform.