If you ever get a chance to see the movie "Motorcycle Diaries" it shows that ANY motorcycle can do the trip. Two guys set out to travel the length of South America on a 1939 Norton single. Overloaded and leaking oil from every gasket, it shows that any motorcycle will do what you want it to do. It's just a matter of preference and style that will help make the decision. Buy what you can afford, load it up and go. Look what the Vietnamese people use to commute, 2 stroke 100cc Chinese junk loaded with their entire family and a pig strapped on the back. ANY bike will work!