A system for allowing a single user to accurately gauge the distance between a trailer connecting mechanism and a trailer ball of a trailer hitch and which provides a mechanism for indicating when the trailer ball is positioned beneath the trailer attachment end that includes a user adjustable center mechanism of a U-shaped mechanism that has a pair of spaced outwardly extending elements such that when the user backs over one of the outstretched spaced elements the trailer ball is positioned beneath the trailer attachment end of the trailer.