CCJPO: I'm dying to hear about this 25,000 mile trip you made. When you get a chance, please click on "Bushie" to the left and send me an email. Did you consider writing a book about your trip? I know it's "been done", but I love stories like that.
To answer your question; my best one was at my grandfather's drive-in burger joint in Springfield, MO, but the next best is Casper's, also in Springfield. Heavenly chili on a heavenly burger.