It seems we are actually talking about the same thing.
What I was saying is the truck doesn't need to detect that it has a trailer, though I am sure there are a number of ways to do that. Just when the accessory camera is on, it automatically replaces the backup camera in the rearview mirror...
Why would the truck need to sense that it is towing? if the addon camera is powered on it is towing. You aren't going to have it turned on wasting its battery if you aren't using it.
They must be different from the toll devices I am used to. what controls do you need? The ones we have in Ontario just sit there and beeps when you get off the toll road.
If there is no DC 12V where I want it (or USB for that matter) I will put it there. I wasn't put off the Model S because it didn't have 12v in the trunk, I just tied into the 30A 12v line for the liftgate and put in my own 12V and USB charging plugs.
Rumor has it CT roof racks will start around $500.
You will be able to get Wheel locking lug nuts for somewhere around $75
Ok, I kinda pulled those numbers out of my ass, but they are based on real prices on the Tesla Shop, so no different than the wrap pricing.
Plus the added benefit that they are stackable to fit several in a small space. This way you can carry a whole stack around so you can easily use multiple boxes to get a measurement.
Unfortunately the real deal has been out of stock for a while: Flux Capacitor - Great Scott! | O'Reilly Auto Parts (oreillyauto.com)
But there's always the Wayfair edition: Ukonic Back to the Future Flux Capacitor Replica USB Mood Light - Wayfair Canada