against a fully inserted hitch ball 12 in the embodiment depicted the frame front interior section interior surface rear part 28 extends approximately 62 degrees from vertical and generally follows the circumference of the hitch ball 12 as shown in fig3 4 in the embodiment depicted therein a line drawn from the frame lip rearmost edge 24 to the frame front interior section interior surface rearmost edge 30 will pass beneath the center of a fully inserted hitch ball 12 fig1 depicts the position of the frame slot 32 with respect to the pivoting ball support 40 the pivoting ball support 40 rotates with the pivoting ball support pivot point 42 from a first position in which the pivoting ball support face 44 is in close proximity to the hitch ball 12 to the second position in which the pivoting ball support face 44 is dislocated allowing the hitch ball 12 to be removed from the frame front section interior 16 through frame opening 20 the pivoting ball support face 44 first position and second position are depicted in fig3 and fig4 respectively in the embodiment shown in fig1 4 the movement of the pivoting ball support 40 is resisted by a first spring 46 and a second spring 48 the second spring 48 provides a backup means for resisting movement of the pivoting ball support 40 from its first position to its second position fig2 4 depict an embodiment in which the ends of both springs are held in place by the first notch 50 and a second notch 52 cut into the frame rear section interior 18 and the pivoting ball support face 44.