I'm not sure the tour divide is an ideal environment for dyno lights. I have heard of failures of older Schmidt hubs and the older version of the Edelux. Nothing so far about newer versions. These were from randonneurs on extended rainy rides over a number of days of heavy rain. BuM lights have failed at the mount. In fact, I bought one cheap because the mount broke. The BuM Luxos U has been plagued with failures. It is an awesome light, but I wouldn't take it into the woods. For one thing, it's huge and heavy.

I didn't really follow the tour divide. The three people I know that have ridden it used dynos without issue.