Not a Ram but I was driving a rental car with adaptive cruise control on a mountain road and it suddenly decided I was about to hit something and hit the brakes pretty aggressively. (I think maybe it was sensing the guard rail since it was a winding road.) I'm sure the truck behind me thought I was brake checking him and my wife started yelling at me, Something like "What the hell are you doing?" She was freaked out about the whole thing and made me agree not to use the cruise control anymore. I complied until we got back on the interstate. It seems to me that ACC is probably something that should be reserved for freeways and major highways, at least for now. The rent car was a Nissan Altima.