I guess my main question is that all the lights will work on the trailer via the supplied
ECU but the above may not work as well with a trailer?
Not sure with an after market
ECU, but on the genuine one yes, the lights will work, but not the safety aids.
If you read your owners manual under trailer towing, the below information is stated:
Only use the Ford approved trailer wiring kit (including the trailer wiring module) when towing with your vehicle. Using generic trailer wiring kits may prevent the correct operation of the rear parking sensors (where fitted) and could damage the electrical systems of your vehicle.
Aftermarket load levelling kits or weight distribution hitches are not suitable for use on the Ford approved towbar.
Do not exceed the maximum permissible nose weight, e.g. vertical weight on the tow ball. Failure to adhere to this warning could result in loss of vehicle control, serious personal injury or death.
Trailer Sway Control
If the trailer begins to sway, the stability control warning lamp flashes and a message appears in the information display. The system applies the brakes to the individual wheels and reduces engine torque to aid vehicle stability.
Stop your vehicle as soon as it is safe to do so. Check the vertical weight on the tow ball and trailer load distribution. See Engine Specifications. See General Information.
Note: This feature does not prevent trailer sway, but reduces it once it begins.
Note: This feature cannot stop all trailers from swaying.
Note: In some cases, if your vehicle speed is too high, the system may turn on multiple times, gradually reducing your vehicle speed.