Furnace Ducts to bedroom Crushed by Blowout

The tires were only 2 years old, I use the camper about once a month, and I have all brand new tires at this time. The inside of the tire wells are a thin metal guard thing. I have a working Carbon Monoxide detector as well. I have used the camper several times during the summer since it happened, but just needed the furnace for the first time recently. The bedroom did not get warm so I gave an extra look up there and saw that they the ducting was not connected anymore. (I didn't notice at first because at the time of the blowouts, my husband handled the blowout situation) It was not brought to my attention that there was a problem with the ducting at that time.