If you are looking for monitoring sytems, inverter questions, charger questions, battery questions, or just components to build a system, the guys at Inverter Service Center (White House, TN) are really helpful. I usually consult with them when doing an install. I've occasionally found their pricing to be competitive with Amazon but the thing you'll never get from Amazon is the expertise and willingness to help. I think they do a lot with the RV industry also but I don't believe they do anything with solar panels. I'd bet they'd be a good resource for you either way.
http://inverterservicecenter.com/
http://inverterservicecenter.com/