Hi MainJet,
I have a little experience here with this subject.
10 years ago I had my '48 AD hauled up to Oregon from Southern California. It was loaded with other vehicles on a transport trailer, you know, the kind of trailer you often see hauling several vehicles stacked on two or three levels. The transport company loaded my truck on the top perch which has an upward tilt. They did not consider the consequences of the angle of my truck in regards to the Fulton I had mounted. It would have been nice if they had loaded the truck on one of the more level berths, or at least loosened and dropped the visor for shipment but they were careless. When my truck arrived in Oregon, it no longer had a visor. In fact, the prevailing wind force pulled the whole thing off of the gutter mounts (raking paint off for 8 inches), and pulled the center windshield molding loose before it finally let go. It whacked the left rear fender on the way down. I hate to think of what other incident it may have caused to cars on Interstate 5 before it came to a final rest. When I addressed the issue with the transport company regarding loss and damage the said, "We are not responsible for an act of God". I know my experience is a worse case scenario but beware of loading the truck at an angle not normal for the visor's design. Just to be safe, lower the visor or remove it for the trip.
Good Luck!
