That's not accurate. We use it all the time while towing, as that's actually almost what it is best for when you are stuck in the slow (RH) lane allot behind slower vehicles...have to believe it is exact same system from what I have read.
Check the warnings in your manual. It should say this -
"Do not use adaptive cruise control when towing a trailer that has trailer brakes. The auto-brake component of the adaptive cruise control system does not operate the trailer brakes. Using adaptive cruise control when towing a trailer that has trailer brakes may result in the loss of vehicle control, which could result in serious injury."
The '18 manual has been changed. Now it only warns against third party brake controllers -
Do not use the system when towing a trailer with aftermarket trailer brake controls. Aftermarket trailer brakes will not function properly when you switch the system on because the brakes are electronically controlled. Failing to do so may result in loss of vehicle control, which could result in serious injury.
edit: actually this is interesting - just to verify I went to ford.com and downloaded the '17 manual to check. Sure enough it uses the same language as the '18. But then I noticed that the manual is edition 2. You can still download edition 1, and that one has the old warning. So either it was a mistake in the first printing or they updated the system sometime in '17. My guess is it was a mistake.
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