84 Windcruiser Restoration/Renovation

Thanks, yeah fixing the roof is the first project. I've already gutted almost everything out of the inside, so now I'm turning my attention to the roof. The previous owner had patched the roof, but it is still sagging at the front a/c. I'm planning on removing the a/c unit this weekend and adding a layer of exterior plywood decking, and covering that with EPDM roofing, I may need some steel angle or studs to strengthen the roof though, not sure yet. Any thoughts?

Attached is a pic of the roof I took this past weekend, along with a pic of the control box for a leveling system that was added. Does anyone recognize it or know anything about it?