Portion of an off-highway truck

FIG. 1 is a front elevation view of our new design;

FIG. 2 is a right side elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a left, front perspective view thereof;

FIG. 7 is a right, front perspective view thereof;

FIG. 8 is a left, front perspective view thereof, shown in context;

FIG. 9 is a right, front perspective view thereof, shown in context;

FIG. 10 is a left side elevation view thereof, shown in context; and,

FIG. 11 is a right side elevation view thereof, shown in context.

The bottom view does not form part of the claimed design and therefore is not disclosed.

The elements depicted in dashed lines form no part of the ornamental design.