The ornamental design for a truckbedtooltie down anchor, as shown and described.
FIG. 1 is a perspective view depicting the truck bed tool tie down anchor with the broken line showing of an element being for illustrative purposes and forming no part of the claimed design; and,
FIG. 2 is a reduced scale side view thereof, the automobile pictured is for illustrative purposes only, and forms no part of the claimed design disclosed herein.