The ornamental design for a ruggednotebookcomputersupportingstand, as shown and described.
FIG. 1 is a front perspective view of a rugged notebook computer supporting stand showing my new design;
FIG. 2 is a rear perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is right side view thereof;
FIG. 7 is a top view thereof;
FIG. 8 is a bottom view thereof; and,
FIG. 9 is a perspective view thereof, but with a broken line electronic device shown mounted on the stand. The broken lines showing the electronic device form no part of the claimed design.