The ornamental design for a cornerreinforcementmember of a tonneau cover system of a pick-up truck, as shown and described.
FIG. 1 is a perspective view of a corner reinforcement member of a tonneau cover system of a pick-up truck showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof; and,
FIG. 8 is an environmental perspective view thereof, wherein the corner reinforcement member is mounted on a corner portion of a frame section of the tonneau cover system of the pick-up truck.
The broken lines shown on FIG. 8 depict environment only and form no part of the claimed design.