Exterior surface configuration for a door trim panel of a truck

FIG. 1 is a perspective view of an exterior surface configuration for a door trim panel of a truck showing a first embodiment of our new design; FIG. 2 is a front view thereof; FIG. 3 is a left side view thereof; FIG. 4 is a right side view thereof; FIG. 5 is a top view thereof; FIG. 6 is a bottom view thereof; FIG. 7 is a perspective view of an exterior surface configuration for a door trim panel of a truck showing a second embodiment of our new design; FIG. 8 is a front view of FIG. 7; FIG. 9 is a right side view of FIG. 7; FIG. 10 is a left side view of FIG. 7; FIG. 11 is a top view of FIG. 7; and, FIG. 12 is a bottom view of FIG. 7. The rear of the trim panel forms no part of the claimed design. The rear surfaces shown in broken lines are for illustrative purposes only and form no part of the claimed design.