The ornamental design for a hauler, as shown and described.
FIG. 1 is a perspective view of a hauler showing my new design.
FIG. 2 is another perspective view thereof.
FIG. 3 is a left side view thereof.
FIG. 4 is a right side view thereof.
FIG. 5 is a top view thereof.
FIG. 6 is a front view thereof, shown in enlarged scale; and,
FIG. 7 is a rear view thereof.
The de-emphasized portions shown inside the broken lines illustrate portions of the hauler that form no part of the claimed design, the broken lines represent an unclaimed boundary that forms no part of the claimed design.