While not done to my V Max, it was done to a big road-burning Yamaha, my FZR1000, and I have another product just like it for the VMax when it comes back from the shop: a Signal Dynamics license plate frame w/dual-l.e.d. bar.
http://signaldynamics.com/index.php...n=com_virtuemart&Itemid=77&vmcchk=1&Itemid=77
On the FZR the rear light wiring is black=ground, yellow=brake circuit, and blue=running lights. The license plate wiring is black=ground, white is running lights, and red is brake lights. I soldered pigtails onto the stock taillight plugs' quick disconnects after using a narrow metal blade to remove them from the nylon plugs, and a bullet connector soldered onto the other end to mate to a female bullet connector from the license plate. Then I used heat shrink tubing over the connectors. I did the pigtails so I would maintain the stock nylon plugs, not have to cut the stock wiring harness, and have a disconnect for the license frame lighting.
It provides a great difference in visibility from the rear of the bike! Brake lighting especially is more-noticeable. Now if I can get the VMax back to duplicate the mod...