I'm gearing up for full-timing with my little guys and I joined a forum called Secular Homeschool (google it) to prep for roadschooling. It mainly non-religious --or just religious people who don't necessarily want a religious based education. But the amount of information from pre-school through high school (including transcripts, SATs, college prep stuff) is AMAZING. It's a great group of people sharing loads of ideas. A handful are "roadschoolers" but all are homeschoolers.
Best of luck to you! What a spectacular way to finish out high school…seeing the country!