The ornamental design for a trailerhitchcover, as shown and described.
FIG. 1 depicts a front view of the trailer hitch cover.
FIG. 2 depicts a back view of the trailer hitch cover.
The broken line showing of the interior structure of the stem portion and the broken line showings of four circular elements are for the purpose of illustrating portions of the trailer hitch cover and form no part of the claimed design.
FIG. 3 depicts an isometric view of the trailer hitch cover.
FIG. 4 depicts a side view of the trailer hitch cover with embossed elements depicting eyes, nose and mouth; and,
FIG. 5 depicts a top view of the trailer hitch cover.