Piece of cookie. You don't need 3. 1 In the middle should be plenty as your front blinker is visible from the side. Buy your blinkers, pig tails and grommets, ask what the ideal hole size is. Buy wire of appropriate gauge and proper crimp connectors (probably wire pliers too as I doubt you have them. A test light would also be a good tool). Buy a hole saw of this size (fits in drill motor and has drill bit to center hole), figure out where you want hole and make sure there is enough room for grommet to clear anything behind hole. Drill hole. Install grommet. Turn on one blinker (key on) and go back to the wiring that feeds your trailer plug. Use test light to find blinking wire and depending on connectors purchased, tap into that line, run wire back to blinker (making sure to route it where it won't be damaged when dumping) and connect pigtail leaving enough slack to hang out of grommet. Plug grommet into light and push light into place. Wah-la! Rinse lather repeat on other side