What a coincidence, another Iron Butt Spyder rider and I were just talking at Spyders in the Ozarks about whether a Spyder has ever done the Dalton Hwy (a mandatory road for a Coast to Coast, or CtoCtoC) and another requirement is that you have to use the same ride for the entire trip.
Has anyone built, upgraded, or customized any model of Spyder to Adventure Bike capabilities? Just a WAG it hasn't been done, we could imagine that very few would even attempt 800+ miles of gravel roads to make it up an back to Deadhorse. Lot's of 2 wheelers do that route, but they're purpose built Adventure bikes...
And for the doubters that it could be done, it's been done on a
Goldwing, a HD Road glide, and a Kawasaki Vulcan, which are NOT Adventure (Dual Sport) bikes....