JP
As I recall, VBT has a "road bike" that has triple chain rings and a pretty relaxed geometry which makes them pretty similar to touring bikes. So go with your road bike or take the bike they provide. Of course, it has been awhile since I went on one of those tours. Also, most of their tours are not that challenging so you should do fine on your own bike. Even on their hardest tours, you are not doing anything really hard.
Pat