The present invention is for a tow hitch insert assembly that allows for natural dangling and swinging motion of an elongated member from a trailer hitch. The elongated member can be of a variety of shapes and in one version is a replica of testicles. The elongated member is coupled to an insert tube main body by a rod that extends through the tow hitch insert assembly. Surrounding the rod are springs on each side, sandwiching the elongated member, which allows for oscillation of the elongated member within the tow hitch insert assembly. In another version, the elongated member is secured via a slotted plate, and the elongated member has a spheroid top wider than the slot of the slotted plate, which permits the elongated member to slide and rotate within the tow hitch insert assembly.