" Prepped for solar " may just mean that wires that are too small were routed somewhere in your MH. I'm just saying that you need to basically be responsible for the entire project. A good place to start reading would be here IMO.
https://handybobsolar.wordpress.com/...ging-puzzle-2/
Many of us here believe that no solar system is complete without a good meter/shunt. You wouldn't be disappointed if you installed a Trimetric meter now while you're still planning your solar. It actually can help in planning the right size system.
As you get better informed and give a little more info many of the kind folks here will be able to help.
And most importantly.....when you're up on the roof. Don't drill there!