I had a sidewall explosion after a day ride in the downpour on the C&O:
https://www.bikeforums.net/bicycle-m...along-rim.html -- scenario
#2 . Loud bang! I was very lucky for it to happen right when I reached Cumberland. So I learned the light way what
10 Wheels says: carry a spare tire on a tour.
Not sure if the tire can be temporarily fixed with a duct tape, but the inner tube is a total loss in this case.