A hatch back construction (10) for the bed (101) of a pick-up truck (100) equipped with a camper shell (200) wherein, the construction (10) includes a hatch back member (20) provided with a step shouldered continuous peripheral skirt (21) having an outer portion (21′) with a minimum width of 3″ and further having an outwardly extending portal sleeve (22) equipped with a door element (30) wherein, the hatch back construction (10) expands the effective length of the bed (101) of the pick-up truck (100) by a minimum of 5″.