The ornamental design for a pick-up truck cover, as shown and described.
FIG. 1 is a perspective view of a pick-up truck cover having one of three panels in an open position and two panels in closed positions showing my new design.
FIG. 2 is a right side elevation view of the pick-up truck cover.
FIG. 3 is a bottom view of the pick-up truck cover; and,
FIG. 4 is an enlarged partial plan view of the pick-up truck cover.
In drawing FIG. 3 the broken lines depict elements of the underside of the pick-up truck cover that form no part of the claimed design.