just some more advice
Sounds like a great trip is in the making - He's is a simple suggestion - pick small roads. The one thing my moto buddies and I have done on numerous trips is to pick up Gazatteers for each state we were going to be in, or in Mexico, just a pile of maps, then we routed the smallest curviest roads we could find - it makes all the difference. Major highways = Exxon, Walmart, Chili's, Petsmart etc every 30 miles. Secondary roads = Leon's Gas and Guzzle, cool general stores that time forgot, great barbeque stands, really nice facinating people etc - and to me at least that is the purpose of a trip - it doesn't matter how far you go, it's what you experience while you're going.
Have fun!
G