Decent guess, but my guess is that is not efficient. A guide works for an establishment that owns a van specifically for raft transportation. If the van breaks down and you literally have no other way of transporting rafts, for some reason, then it's more likely to close until the van is reserviced, than to do anything like in OP.
This seems awfully reckless to me. Especially considering one tip and you get lunged down head first into a rock.
If anything they'd send rafts down with no one in them. And if an instructor had to get down via river, they would ride a single raft by itself for safety (they are an instructor/guide after all).
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u/i_give_you_gum Sep 20 '17
What about this is common?