...my most enjoyable distance rides (200-600 miles in a day) have always taken place on the Dualsports I've owned. (from 250's to 650's)
Why, is because they're the only ones with a really stable geometry, 21 in fronts and the suspension to suck up Pennsylvania's shitty road conditions.
On Sportbikes, Cruisers and Standards, I've managed to blowout tires, bend rims and even blow out a suspension or two; none of which I would want to have happen abroad where parts availability might be an issue.
I learned my lesson. Any bike might be able to travel anywhere but, I'll always hedge my bets on a D.S. being able to do it better.
F.W.I.W. my definition of a D.S. is a true 50/50 bike like a DR650 (or comparable model) that forms a great starting point to take you in the direction you want to go.
Good luck on your Journey.