Unfortunately, the fact that Tesla model 3 is such an advanced car, brings its challenges, this is one of them. We are trying to add medieval style of wiring to model 3 next generation wiring and systems. I would definitely NOT splice any OEM wires. Nor would I try to tap some unknown nodes for ground or power. The system is too smart to detect vampire draw and go into “alarmed” state.
The stealth hitch, basically relies completely on power drawn from the battery .... there should not be any issues with that. I read few reviews that it works, but I do not know for sure what module to translate turn and brake signal they exactly use. I doubt it’s their own ...
I still think Tesla will eventually offer OEM solution in North America, because they know this would happen and in the end it will hurt them .... people simply do use the vehicle to transport bikes and most people hate themn on the roof, even if it would be safe to do so. Often it is not ...
I think the evidence of the bottom cover and ready to go harness, is evidence of it. I just wish there would be more info regarding the harness.
No hitch no Tesla for me .... :-(
BTW, The EcoHitch might be OK, but the fact that you have to deal with the silly bolt which requires torquing every time I want to hide the hitch 2” square end, is just not cool. Over winter it’s ok, but in the summer, I use it once a week ... so I am used to frequently taking the ball end out. The Stealth is the right solution, kind of like most Euro cars have it. It takes 5 seconds, no wrench required. The Euro Tesla model 3 is the same way ...