This happened about 100 miles from home. We felt a slight "bump" but saw nothing, everything looked good in my mirrors and we carried on home. Upon arrival, backed into the driveway, unhitched and when I went to chock the wheels found this !!!!
Now the spare is on and I am getting a new tire before our next trip.
Next time I hear a "bump" I will pull over and check it out !!!
Could have been nasty. Still can not believe we went 100 miles on this !!!