The ornamental design for a tailgatecover, as shown and described.
FIG. 1 is a perspective view of a tailgate cover;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a front elevational view thereof;
FIG. 5 is a rear elevational view thereof;
FIG. 6 is a right side elevational view thereof; and,
FIG. 7 is a left side elevational view thereof.
In the drawing figures, the broken lines in FIG. 1 depict a truck while the broke lines in FIGS. 2-7 show attachment elements and form no part of the claimed design.
The crosshatched pattern, although shown intermittently, is understood to be distributed uniformly over the surfaces of the claimed design upon which it resides.