i'll just throw this out there with the vague information at hand. on the 20 if you are using mono you would probably want 6lb, set your drag to about 2lbs. the rod should be rated near that say 4-10lb. the interwebz said the gx2 comes in L,M,MH and H with that reel the L is what would balance best.
on the 65 if using mono use 15, 17 or 20lb at the most, your drag should be set to 3-4lbs. the tundra 10 footer is rated 10-25lb so you are in the middle of the range on that, its also rated at 3/4- 2 1/2oz of weight, so don't try to throw more than that..
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