My Rostra cruise control unit came in today. I set it up, and found it doesn't work if I have LED brake lights! The unit grounds to the brake light ground, and I end up with lit brake lights rather than a grounded cruise control unit.
I also am in the works of designing a transition from the back of my car to my trailer:
I'll need to round the back edges, paint/color/duct tape it, and possibly add a strap to prevent it from torquing in the wind.