I'm glad that you're looking more comfortable with this trip idea. Why don't you try taking some 1 day trips before the many days of short trips trip? Like drive 200 miles away to something you've always wanted to stop and see, but never taken the opportunity and then turn around and go home. It will help you to judge what you're capable of in one day. Like - I know that I can drive from Keithville to New Mexico in one day, but can't sustain that type of schedule for more than one day. I'm just too tired the next day.
I'll be looking forward to seeing more of your itenerary. I've never really traveled in those parts of the country - but I'm really good at moral support. :)
Laura