The ornamental design for a truckbed, as shown and described.
FIG. 1 is a top rear perspective view of a truck bed showing my new design,
it being understood that the broken lines are for illustrative purposes
only and form no part of the claimed design;
FIG. 2 is a side elevation view thereof, the opposite side being a mirror
of that shown;
FIG. 3 is a rear elevation view thereof; and
FIG. 4 is a top plan view thereof.
The front of the truck bed is understood to be flat and unornamented.