I claim the ornamental design for a truck bed mounted trailer hitch storage unit, as shown and described.
FIG. 1 is a front, top and side perspective view of the truck bed mounted trailer hitch storage unit embodying the design of the present invention, a trailer hitch being shown in dotted lines, a truck bed is also indicated in dotted lines, with the truck bed and trailer hitch forming no part of the invention.
FIG. 2 is a front elevational view thereof.
FIG. 3 is a side elevational view thereof, the side opposite being a mirror image.
FIG. 4 is a rear elevational view thereof.
FIG. 5 is a top plan view thereof.
FIG. 6 is a bottom plan view thereof; and,
FIG. 7 is an exploded perspective view thereof, with trailer hitches being shown in dotted lines, with the trailer hitches forming no part of the invention.