Just happened to me as well on my shakedown cruise. My problem is I do not know when in the past 10 days it happened and it has been raining EVERY day, really bad. I just hope I didn't get as lot of water in my attic. I plan on documenting this to FR in a letter. All hardware on both vents were loose. I think it is reasonable to expect stuff to stay attached, especially for a few weeks.I have attached a picture of my temporary fix. Now don't laugh, you do what ya gotta do on the road. By the way they are called Mushroom vents. Look on e-bay. Can't tell if it is the exact vent but an RV supply house out of WY has them. Send me a PM and I will send you the link.
2013 Ford F-350 SD Diesel, 4X4, Crew Cab, Lariat
Sabre 2014 32RCTS, Pullrite Superglide 2900 18K