Made it a whole day early. It wasn't so bad ('cept the sunburn part). But I think that if I ever do it again, more stops and taking in the lay of the land. Now that I have a feel of time/distance I can make adjustments.
A few things to keep in mind for a trip like this: Sleeping bag (just in case you get too tired on the road and there is no motel/hotels near by). Sunblock (for your "drivers' arm"). Cheap styrofoam cooler lined with a plastic bag (for drinks and ice). These were things that I learned along the way.