Made that trip on a motorcycle a few times. In the summer. I'm stupid.
I'm stupid too... I've made the Oklahoma to San Diego trip about 20 or so times total in my life and once on a sportbike taking only one overnight Grants or Winslow, can't remember, too many years ago. It wasn't as fun as I had imagined it would be. I should have taken more stops.
That brings to mind something since you won't have AC and likely windows down etc... STAY HYDRATED. Wait, you know that already... you're the Plan B guy so you'll have a Camelbak strapped and going.