The ornamental design for a trailerhitchattachmentmember, as shown and described.
FIG. 1 is a perspective view of an trailer hitch attachment member showing my new design;
FIG. 2 is a bottom view of the trailer hitch attachment member;
FIG. 3 is a top view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a frontal view thereof;
FIG. 6 is a side view thereof as viewed from the right-hand side of the trailer hitch attachment member shown in FIG. 5;
FIG. 7 is a side view thereof as viewed from the left-hand side of the trailer hitch attachment member shown in FIG. 5;
FIG. 8 is a bottom view of the trailer hitch attachment member showing an extendable tubular member sized to fit within a trailer hitch receiver in a use position;
FIG. 9 is a top view of the trailer hitch attachment member showing a lid configuration; and,
FIG. 10 is a top view of the trailer hitch attachment member showing another lid configuration.
The broken lines shown in the drawings illustrate portions of the trailer hitch attachment member that forms no part of the claimed design.