I added powerful off-road LED flood lights to my back bumper (2x) and front a-frame (1x). They're controlled with a key-fob remote. The front is wired into the 12v same place the 7-way connector hooks into the trailer wiring. The back ones, I drilled a very small hole through the floor and ran a wire to my battery bank fuse-block.
For wiring I used computer electrical cord, the kind that have the 3-prong male and 3-way female IEC connector. They're free to me and are nice double insulated cables, cut the ends off and I got three conductors to make use of.
Some will correctly point out, you can't get away with this in all states, as an RV is considered a highway vehicle, it has to comply with safety laws, some of which prohibit additional and/or independently controlled lights. In Michigan, I'm supposed to have covers on mine while I'm on the public roads. However, I feel as long as I'm not being an arse with them, I won't attract attention. I completed an 11,000 mile round trip visit to Alaska with these lights, and no cops complained the entire way.