Greg,
That's a good start, you'll probably end up expanding it! I have a fixed solar system on the roof of my Airstream and recently purchased a 200W Renogy solar suitcase. In case you're not familiar, it is a portable system that plugs into the trailer but can be moved into the sun if needed; the idea being that you park the trailer in the shade and put the solar suitcase in the sun. I got it during their sale too, some pretty good deals. I previously purchased and installed a pair of 100Ah Battleborn lithium batteries.