Just joined! But I’m about an hour from cutting into my factory wiring harness 😭 So I could use help ASAP!

I have a curt adapter but still have to find the correct wires for signal. I took a peak at the wrapped bundle to the tail lights but I didn’t start unwrapping.

Lomg story short, I’m taking my S60 on a 12k Mile Road trip and have a cargo carrier, the carrier has a 10” riser from a class 3 (2”) hitch making it 17” off the ground. I’ll be using a 24”x24”x60” softbox, so it covers the tails, signals, and plate, so to avoid unwanted attention and to be as safe as possible, I modified the cargo carrier to have trailer lights. Finished wiring the carrier last night at 4:30AM, ready to start on the car. I do know I’ll need to run power from the battery to the trunk. I’ve installed audio systems in previous cars, so I feel quite comfortable doing this. Any help appreciated!