I'd like to point out a few facts here on driving to Colorado.
If you are starting from DFW, then US87 via Vernon/Childress makes way more sense. Dallas to Denver is 791 miles that way. Routing via Lubbock and Santa Rosa would be 946 miles. That's not trival.
Temple, TX is about where the line is for choosing via DFW/Childress/Amarillo vs Sweetwater/Lubbock/Amarillo . Points south of Temple would be shorter going via Lubbock, Temple and points north do better through Amarillo.
And in almost no case does it make sense for an 85 to go up I-25 via Santa Rosa and Las Vegas vs going through Amarillo and Raton. Even if you have to stop for an hour charge at a KOA (which you probably won't) , you will be faster driving through Clayton than going through Santa Rosa and Las Vegas.
In my dream world I'd add SCs in Clayton, Vernon, and Lubbock.
As far as traffic, and expected SC utilization, I'd say that Vernon would get used more than Lubbock. There is a lot more traffic between Amarillo-DFW than Sweetwater/Midland-Amarillo. The SC is a bridge between two points, and isn't designed to serve the locals.
Look at :
Historical Traffic Counts - NCTCOG.org to see traffic counts
The SC isn't for the local people it's for folks in between destinations.