Lots of great information in the archives area that I found helpful when doing my installation, first on my RV and then on my house. There are companies like AMsolar.com that specialize in solar equipment for RV's and they are great in providing advice as well as the big and little parts you will need to put it all together.
Start with making sure your RV has an accurate charge monitor. If not the Trimetric is a good choice and will provide information on how much you use when off the grid and how fast your battery bank recharges while driving or once you have an electrical hookup.
From that information you can determine how much charging capacity you need which is important so you do no over build or under build the system for your RV. If you have half the charge capacity you need it is inconvenient and if you have double the charge capacity up to half the money you spent was wasted.