I can't answer your question, and honestly don't know if my Redwood has solar prep. If Redwood fivers are like most rv's, the solar prep allows for a very limited system. Just enough to maybe trickle charge the batteries.
Is that what you desire to accomplish, or are you looking for a "real" solar set-up? If looking for a "real" system, I recommend reading Handy Bob's stuff on solar. He's a bit out there for some folks, and some say he's wrong, but his systems work. Jack Mayer's stuff on RV electrical is is good information, as is Marx's 12 volt side of life. All can be found with a simple internet search.