The ornamental design for a truckbed, as shown and described.
FIG. 1 is a top perspective view of a truck bed, showing my new design;
FIG. 2 is a top perspective view thereof;
FIG. 3 is a bottom perspective view of FIG. 2;
FIG. 4 is a rear elevational view of FIG. 2;
FIG. 5 is a front elevational view of FIG. 2;
FIG. 6 is a left-side elevational view of FIG. 2, the right-side elevational view being a mirror image thereof;
FIG. 7 is a top plan view of FIG. 2; and,
FIG. 8 is a bottom plan view of FIG. 2.
The broken lines showing a truck and wheels in FIG. 1 depict environmental matter and form no part of the claimed design. The remaining broken lines represent portions of the truck bed that form no part of the claimed design.