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Adding towing lights to 2018 model 3

I have a hitch already mounted that can tow up to 2000 lbs, initially to just get bikes around. However we need to fetch some stuff that is likely not going to fit in the car and it would be nice to have the option of renting a trailer. But I don't have the towing lights harness installed and the one video I saw at e-trailer (where I got the hitch in the first place) made it look like a pretty huge deal (running a power line up the battery!)

I did some searching here but didn't find any obvious answers to this question.

So is there a convenient way to add a towing lights connection? Or is it something that I'll have to take to a shop for an expensive install?