George, I suppose it can be boiled down to "bicycle camping". We all know it's more complicated than that, which leads me to comment that if you're trying to organize a charity overnighter you may find a larger pool of contributers if it's supported.
On two recent charity rides I rode there were no other dedicated touring frames that I saw and only a handfull of bikes equipped with a rack or even a wicker basket on the handlebars.
Brad