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A lot has to do with the lack of info from Ford on what is and isn't included with factory TT. If you have TT, the signal leaves the BCM under the dash, goes back to the t railer module on the left rear wheel housing, all the way back up front, out, then under the vehicle all the way to the trailer plug.I've been saying this for weeks, I don't understand why people are freaking out about the trailer tow kits. This lighting technology already has solutions for trailer tow, and Ford sells it. The only circuits that are left for someone wanting trailer brakes is 1: Optional Reverse wire, 2: Breakaway battery charge wire, and 3: Braking wire. The worst case wiring requirements will be tapping the brake pedal switch for braking signal (relay req'd if ground triggering) Run a 12V+, Brake circuit (post controller) to the rear, and a reverse tap if you need one.
Until these start hitting the ground to figure out what is or isn't there on non-TT rigs, it's just a whole lot of unknown. Like you said, at worst, buy the Ford accessory trailer light module and tap into your rear lights to get signals for the module. Flat 4 but better than nothing.