Since it's an 07 with the 3 wire tail it will have the 2 wires one for brake/turn and one for running and of corse the ground . All I know is these truck are very picky when it comes to the wiring . I would try it on the turn/brake light first and see if it has any ill effects . not sure but you might have to put one on but wires . Hope that helps a little .
OH brain fart . I have Switchbacks in the front and I have a 3 ohm res on the front turn signals and led bulbs in the back without any res in the back since it's all tied together so I am guessing that if you tap the turn/brake wire you should be fine .