Superduty Navigation System

I am somewhat concerned that the navigation system (GPS) that is available for Superduty trucks does not take into account the size of a trailer that may be towed. Example: My 5th wheel RV is 38 feet long, 8 feet wide and 13 feet tall. The concern is that i will be routed on roads that can't accomodate the load. other manufacturers offer products that can be set for the size of the load, in fact, I'm sure that one of these must be building the nav systems for Ford so the software change surely couldn't ammount to much. I would order a truck with the navigation system if I knew that it would take the size of my trailer into account.