Just bought wiring harness for my Honda Element and Im going to do the wiring myself. It's easy to do . The hardest part of the whole job is removing the inside panels to run the wiring. Look on line at Demco Towed Connector Electrical Hook-Up.
I have magnetic lights I use as back up . If you decide to use magnetic lights make sure you buy the good ones not Harbor Freight . Iv used both and you get what you pay for. The LED's are the best Iv used. I also use picnic table cloth pins on the windows to hold the wiring. If you have any kind of a trailer with lights it's smart to have a set of magnetic lights for emergency.