Well, it's kind of done.
I was finishing up the wiring while texting a friend, and told him about how the harley has different wiring than a car so I used different lights for the turn signals and brake lights to keep power from back feeding through the wiring. He then told me about diodes, which is exactly what I need. Oops. Today I'm going to go get plates, I'll work on the wiring some more tonight.
The test ride was about what I expected. Can't tell the trailer is there except for acceleration is worse, and the noise. I'm going to add some rubber to the bottom of the box to try to quiet it down. The other sound is my exhaust note bouncing off the trailer. I have a quiet exhaust though, not a big deal at all.