About 3 miles down the hill from the Providence Mountains campground, I hear a big "clunk" and feel something dragging
Ooops, the brace holding my bike rack to the back of the seat post just snapped off!
I pull over and calmly remove the broken rack adapter and bolt the rack directly to the bike's braze-ons instead. The rack is now a bit tilted, but it's more structurally sound like this anyway.
Back on the road!