I always put backup lights on my RVs. We often leave late Friday after work for a weekend of camping and arrive at the campground after dark. Having backup lights is much better than using flashlights. I also have a switch in my truck so I can turn all the lights on from the truck. If I have to make a tight turn or do a u turn after dark I will turn on the lights so I can see where the tires are on the RV.
I have 5 lights. Two on the bumper and two near the front mounted underneath and aimed at the tires. The last one is mounted on the kingpin pointed at the fifth wheel hitch. I like to double check the hook up.
The standard RV wiring harness and plug has a yellow wire for backup lights. It is energized when the tow vehicle is placed in reverse. You can get access to this wire in the junction box.
You don't want to hook this wire directly to your RV backup lights. That will pull too much current through the tow vehicle. Use a relay in the RV. The yellow wire activates the relay. Hook one side of the relay to the RV battery and the other side to your lights. I also added a switch in the storage area of the RV connected to the battery and light sides of the relay. This allows me to flip the switch and turn on all the lights at night after I have disconnected the tow vehicle. Sometimes I like to do a walk around at night before going to bed. Flipping on the lights allows me to eyeball things.
LED lights are not cheap but they are much cheaper than a few years ago. I purchased two sets from Northern Tool and I am happy with them. They are bright and draw little current.
Here is the write up I did when adding backup lights to my 2002 Wildcat.
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© Bobby Daniel