Boy - was this family and cat lucky! After a trailer had been delivered to Camping World and turned over to them, the sales manager was inspecting the roof and he heard a "hiss." Turns out it was a cat and it had ridden 60 miles on the roof! You can see the video at CBS Sacramento.
Of course, the person or family did not intend for the cat to come, and you certainly would not put it on the roof. However, many people do let their cats and dogs run loose when they travel. It may work fine, but not if you have an accident. A cat, which had to be loose and not in a carrier, was the only fatality in an accident on Reno Highway in Nevada. A truck turned in front of a motorhome pulling a cargo trailer and the motorhome couldn't avoid it. They struck a power pole. You can see photos at the NevadaAppeal site.
This is George's dog, McDuff, who has since passed away, relaxing on the 5th wheel's love seat. We did not leave him in the trailer when he traveled. He was in the truck. Both in a truck and motofhome, a carrier is not only safer for your pet but it keeps them from interfering with your driving. And, secure it in some way so it does not become a projectile if you have a collision. Jaimie Hall Bruzenak