I donít have any answers for you on the roof real estate issue, but i have been kicking around this same idea.
I was really impressed with this set-up ( Riveted: Technology
) by AM Solar. So I contacted them to get a price. This is what Roger at AM sent me back:
400 watts of solar, a 30 amp MPPT controller, a 1000 watt inverter with built-in converter/charger and battery monitor, 6 AGM batteries (total capacity of 900 amp hours), and all the interconnecting hardware, fuses, sub panels and breakers for $9700.00.
That includes installation, but Wow, not cheep! I figure about $6000.00 of that price is labor. I think itís going to be a DIY project if I decide to do it.
I was think I could fit some AGMís under the bed, and replace the two stock batteries as well. But the biggest obstacle in my mind is running the wiring.
JC may have a roof drawing for the 30í Classic, I found this one but has not been much help for me.