The ornamental design for an anti-wobble hitch insert, as shown and described.
FIG. 1 is a perspective view of an anti-wobble hitch insert of my design;
FIG. 2 is a front view of the anti-wobble hitch insert of FIG. 1;
FIG. 3 is a rear view of the anti-wobble hitch insert of FIG. 1;
FIG. 4 is a left side view of the anti-wobble hitch insert of FIG. 1;
FIG. 5 is a right side view of the anti-wobble hitch insert of FIG. 1;
FIG. 6 is a top view of the anti-wobble hitch insert of FIG. 1; and,
FIG. 7 is a bottom view of the anti-wobble hitch insert of FIG. 1.
The dashed lines represent environmental structure and form no part of the claimed design. All other surface(s) or portion(s) of my designs not shown in the figures or otherwise described in the specification form no part of the claimed designs.