I wired mine a few days ago. I used a universal 119190kit that etrailer that works with German cars. As another member posted earlier each turn signal and brake light work together and will have to be bridged near where the shock is connected to the rear passenger hatch. You will have to remove the rear interior pillar which is just clips. Once removed the black/grey and black/orange is the turn signals and brake. you will need to bridge those two wires with enough wire to reach the lower panel opening so that you can mount the trailer kit. since it is a two wire system you will ground the white cable and red cable to the existing ground nut right inside the access panel. I ran a power cable to out the little rubber grommet at the bottom of the passenger side compartment. The tricky thing for me was finding a wire for the running lights. I found the lighting wire for a side light but when the rear hatch closed the power went dead so I could not find one I could bridge to for lights only. Instead I found a wire that would cut on and off with the engine and it works fine. The only issue if you want to consider it one is that the trailer lights are on when hooked up and car is running. Day or night. For me I like it better because it makes the trailer more noticeable with the lights on. I just loaded some new pics of the Q3 with the trailer if you want to look at them. The hidden Hitch you got is the same as the Draw tite and Reese. I went with the Reese because the people I bought it from had that one in stock. Hopes this helps.