The ornamental design for a postattachable to the underside of a truckchassis allowing for the securing of a chain to a sparetire, as shown and described.
FIG. 1 is a top, front and side perspective view of the post attachable to
the underside of a truck chassis allowing for the securing of a chain to a
spare tire embodying the design of the present invention;
FIG. 2 is a front elevational view thereof, the rear being a mirror image
of the front shown in FIG. 2;
FIG. 3 is a side elevational view thereof, the side opposite being a mirror
image of the side shown in FIG. 3;