You would need to do the waterproof backup lights, the same lights as your brake/turn lights on the trailer now. The hardest part will be mounting them. The trailer companies normally cut a hole in tubing to accommodate the light and grommet. Then you'll have to wire it up to your normal trailer wiring and add a 5-plug at the tongue. Will also have to add a 5-plug to the tow vehicle.
Chris
No Slip Gator Grip
www.wakejunky.com