On occasion while towing a trailer, the vehicle provides a 'tone' that I believe is meant to be an alert of some kind. The truck does not provide any explanation message or idiot light on the IP. I cannot find any mention of it in the digital owners manual. Does anyone know, what are the towing conditions that cause that tone, and what should I be doing about it??

 

What does that mean as far as towing condition or action to take?