Way to go Tynan and Todd! Great to see you both keeping up a vegan diet while traveling. I've traveled all over the world as a vegan, and while it can be challenging, it is not impossible. You just have to learn to adapt and be resourceful (e.g. live on fruits and nuts for a day if no other good vegan food is available).
If there are any athletes reading this post that have questions about fitness or energy levels you can maintain on a vegan diet...you should check out a resource I have found (www.veganbodybuilding.com) that has profiles, articles and forums full of vegan bodybuilders and endurance athletes.
Personally, I've been strict vegetarian for 20 years and vegan for 6 (I'm 28 now) and have done a couple Ironmans and many other endurance events....all as a vegan. So it is possible, it just taked some education and discipline. The China Study that Alex recommends is great, I also recommend John Robbins "Diet for a new america" and Brendan Brazier's "The Thrive Diet" for further reading.