Here are some sites that look at affordable ways to travel the country
http://www.cheaprvliving.com/ http://www.carliving.info/
http://www.frugal-rv-travel.com/ http://rvsueandcrew.net/
http://www.thegoodluckduck.com/ (Good links to other sites. look on the right side of the blog)
http://meandmoonbeam.wordpress.com/the-building-of-moonbeam/
I'm sure you'll get good ideas from one or more of these sites. There are many ways to travel the country by "rv" and not all require a huge investment.
Good luck to you and the band. Go for it!! I wish I had done it when I was young and hope I get to do it before too much longer!
