Do we have any idea what type of incompatibility there was with the brake system? I’m not too familiar with flat towing, but is this about a requirement that the tow vehicle braking activates the Ranger’s brakes (like trailer brakes)?
I experienced something similar on my first long trip: Initially I observed it lower the set speed when I went through a construction zone with slower speed limit, that was pretty intuitive. Then I noticed that regardless of what speed I set, it would reset it to the posted speed whenever I went...