The ornamental design for a trailer, as shown and described.
FIG. 1 is a perspective view of a trailer according to my new design;
FIG. 2 is a right side elevation view thereof, the left side being a mirror image thereof;
FIG. 3 is a top elevation view thereof;
FIG. 4 is a front plan view thereof;
FIG. 5 is a rear plan view thereof;
FIG. 6 is an enlarged perspective view thereof of detail circle 6 shown in FIG. 1; and,
FIG. 7 is an enlarged cross section view thereof taken along section line 7—7 of FIG. 3.
The broken lines immediately adjacent the shaded areas represent the bounds of the claimed design while all other broken lines are directed to environment and are for illustrative purposes only. The broken lines form no part of any embodiment of the claimed design.