The ornamental design for a trailerlock, as shown and described.
FIG. 1 is a front, right and top perspective view of a trailer lock, showing my design.
FIG. 2 is a rear, left and bottom perspective view thereof.
FIG. 3 is a front elevation view thereof.
FIG. 4 is a rear elevation view thereof.
FIG. 5 is a left side elevation view thereof.
FIG. 6 is a right side elevation view thereof.
FIG. 7 is a top plan view thereof.
FIG. 8 is a bottom plan view thereof; and,
FIG. 9 is another front, right and top perspective view of the trailer lock in a state of use showing an unclaimed cover.
The broken lines shown in the drawings are included for the purpose of illustrating a cover and portions of the trailer lock, all of which form no part of the claimed design.