When the circular loop of {TAIL ~ the hitch} is dropped over the hitch ball of the towing vehicle, the towing vehicle is pulled forward to draw the elongate extension around the narrower neck of the ball, where the extension is captured by the larger diameter of {HEAD ~ the ball} and cannot release except by drawing the tote forward relative to the towing vehicle 
When the circular loop of { TAIL ~ the hitch } is dropped over the hitch ball of the towing vehicle , the towing vehicle is pulled forward to draw the elongate extension around the narrower neck of the ball , where the extension is captured by the larger diameter of { HEAD ~ the ball } and can not release except by drawing the tote forward relative to the towing vehicle
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