LATCHING STRUCTURE OF TONNEAU COVER

A truck cover system is proposed according to some embodiments of the present invention. The truck cover system includes: a rail coupled to a wall of a truck, wherein the rail comprises a channel on a top portion of the rail and a latching slot at a side of the rail; a latching insert inserted in the latching slot, wherein the latching insert comprises a first through hole and a positioning hole; a latching positioner comprising a first side and a second side opposite the first side, wherein the latching positioner comprises a second through hole aligned with the first through hole and a positioning pin aligned with the positioning hole, wherein the latching positioner further comprise a stop plate pivotably coupled to the second side of the latching positioner; and a latching housing releasably latched to the latching positioner.