This reminds me of the saying, "Less clothes, more money." Take what you need. If you've got money, then going by bmx isn't a problem if you can handle it. 65 miles on my fixed gear on flat terrain took me around 4 1/2 hrs (vicious headwind). How long can you stay on your bike at one time? That and equipment will be your limiting factor, I believe. Bmx's are pretty tough, but you'll have to take tubes, patch kit, spokes, cables and other supplies you won't be able to find easily on the way.