Phase II is up and running, baby!!
Phase I basically got me a working system - but I soon realized that I needed more storage capacity. So, this year I added an AGM battery that I can keep inside my tow vehicle. It's hooked up to the panel on the roof and can charge while I'm traveling or any time I'm parked in the sun. This will be especially handy when I'm camping in the very shady pacific northwest - during the day, when I'm off doing touristy things the AGM can charge up. Then when I return to my campsite, I can plug the AGM into the trailer and have 2 12 volt batteries of capacity for a total of about 175 amp hrs.
It still looks a little sketchy, but it all works! I can run the furnace all night and barely notice the battery drain.