Here are the two bike shops in Wichita Falls. They can answer your questions about the route and probably set you up with a SAG. Highly doubtful I will be there. The son's college move in plans are still up in the air. Plus, and this is a big plus, it appears the virus will be spiking in that area right around that time. Probably better to wait until next year. As Forest would say, "that's all I got to say about that." Anyway, if you are going, here is an idea for you. If you are staying in Burk,(as referred to by the locals) you should think about starting and ending the route in Burk. Your hotel is most likely less than a mile from the route. Logistically, it would make sense. More importantly, you would put that stretch headed south into the blistering wind into the first 50 miles instead of the last 20. That matters if you have some lightweights in your group that struggle in the wind.
https://www.thebikestoponline.com/
https://endurancehousewf.com/
https://www.hh100.org/hhh-endurance-ride