FIG. 1 is a perspective view of a cover for a transport refrigeration unit showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a left side elevational view thereof; and,

FIG. 6 is a right side elevational view thereof.

The fragmentary broken line representations of the front of a trailer in FIG. 1 are for illustrative purposes only, and form no part of the claimed design.