Trailer Coupler Lock

FIG. 1 is a front top left perspective view of a trailer coupler lock showing a new design; FIG. 2 is a rear bottom right perspective view thereof; FIG. 3 is a right side elevational view thereof; FIG. 4 is a left side elevational view thereof; FIG. 5 is a front elevational view thereof; FIG. 6 is a rear elevational view thereof; FIG. 7 is a top plan view thereof; and, FIG. 8 is a bottom plan view thereof.