The ornamental design for a treestand harness, as shown and described.
FIG. 1 is a perspective view of the tree stand harness mounted to a folded tree stand;
FIG. 2 is a perspective view of the tree stand harness shown in FIG. 1;
FIG. 3 is a front end view of the tree stand harness shown in FIG. 1;
FIG. 4 is a rear end view of the tree stand harness shown in FIG. 1;
FIG. 5 is a right hand facing side view of the tree stand harness shown in FIG. 1;
FIG. 6 is a left hand facing side view of the tree stand harness shown in FIG. 1;
FIG. 7 is a top view of the tree stand harness shown in FIG. 1; and,
FIG. 8 is a bottom view of the tree stand harness shown in FIG. 1.
The tree stand which the tree stand harness is mounted to in FIG. 1 is illustrated with broken lines and is included for the purpose of illustrating the environment of the design only and forms no part of the claimed design. The remaining broken lines shown in the drawings are understood to represent stitching.