The ornamental design for a torsiontrailercoupler, as shown and described.
FIG. 1 is an isometric view of the torsion trailer coupler as attached to a trailer;
FIG. 2 is a front isometric view of the torsion trailer coupler of FIG. 1;
FIG. 3 is a back isometric view of the torsion trailer coupler of FIG. 2;
FIG. 4 is a left side view of the torsion trailer coupler of FIG. 1;
FIG. 5 is a right side view of the torsion trailer coupler of FIG. 1;
FIG. 6 is a front view of the torsion trailer coupler of FIG. 1;
FIG. 7 is a back view of the torsion trailer coupler of FIG. 1.
FIG. 8 is a top view of the torsion trailer coupler of FIG. 1; and,
FIG. 9 is a bottom view of the torsion trailer coupler of FIG. 1.
The broken lines depict portions of the torsion trailer coupler and the trailer environment that form no part of the claimed design, and are for illustrative purposes only.