Take a look at the Wind/Sun Forums. I used them a lot (as noted in the blog below) on deciding solar today isn't what I want as well as just a TON of great info. http://www.wind-sun.com/ForumVB/
While they don't have an RV section, the Beginners Corner tends to have RV folks. The nice part is there a lot of folks there that have and do solar exclusive - either on their house/business or RV.