The ornamental design for a fairing for a trucktrailer, as shown and described.
FIG. 1 is a perspective view of a fairing for a truck trailer showing my
new design with the trailer body in dotted lines for illustrative purposes
only;
FIG. 2 is an enlarged side elevational view thereof, the opposite side
being a mirror image of that shown;
FIG. 3 is an enlarged top plan view thereof; and
FIG. 4 is a greatly enlarged front elevational view thereof.