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Are we thinking these cars are on Dignity Ace? It left Shanghai 09/10. 9 days between departure and VIN assignment. It's possible that they aren't finished.
I saw the link you sent with the trailer ECU. I'll definitely consider it. I'll also tow a bike rack so the beeps will annoy me too. Are you planning to contact Tesla to activate trailer mode?
Thanks @Leeroy. That's awesome. I notice the Stealth hitch comes with a wiring harness but you must have to cut into the cars tail light and blinker wiring. The plug sounds like a better option.