Another thread about a Ford truck not recognizing the trailer got me curious enough to look up the manual for that truck. While I didn’t see anything about that issue that hadn’t been said in the responses I did find a note that the trailer’s wiring should be disconnected from the truck before backing into the water.
I looked at the manual for my Avalanche and there is no warning like that. Is this something unique to the F150? Is Ford just doing a CYA?