I have just finished looking over mods for Disable and Search, and am beginning to believe the only things needed for a competent Trapper may be just Skills and Feats.
Enhancements and Magic Items will QUICKLY put you in the 95% success category.
I would guess a Disarm Skill of ~12-14 would give you about a 60% success rate in 10th Level Quests where the average DC is ~18.
Assuming of course a perfect world where DC's are static and uniform. (Which we know they are not)
See what your Disarm is without any Enhancements, just Skills, Ability Mods and Feats.