The ornamental design for an off-road jack, as shown and described.
FIG. 1 is a top, front, right-side perspective view of an off-road jack
FIG. 2 is a top, rear, right-side perspective view thereof.
FIG. 3 is a front view thereof.
FIG. 4 is a rear view thereof.
FIG. 5 is a left-side view thereof.
FIG. 6 is a right-side view thereof.
FIG. 7 is a top view thereof; and,
FIG. 8 is a bottom view thereof.
The broken lines showing wheels, tires, fasteners, a left extender, and a lever arm represent unclaimed portions of the off-road jack form no part of the claimed design.