The ornamental design for a trollfishingrigsupport, as shown and described.
FIG. 1 is a perspective view of a troll fishing rig support showing my new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a front elevation view thereof;
FIG. 5 is a rear elevation view thereof;
FIG. 6 is a right side elevation view thereof;
FIG. 7 is a left side elevation view thereof; and,
FIG. 8 is an alternative perspective view showing the support in the environment of being assembled with bolts onto a standard fishing boat seat pedestal.
The broken lines form no part of the claimed design. The fishing rod holder, cup holder, cup holder hole, bolts, and fishing boat seat pedestal are all drawn in phantom and form no part of the claimed design.