An interstate from nowhere to nowhere, that’s the ticket. You can’t create a demand for traffic where there is none to begin with. Just build decent access highways to I20 if warranted
The problem with the interstate system is that it was built to connect downtowns to downtowns (in part to evacuate survivors of a nuclear war).
Hitler was smarter. He designed his system to bypass city centers so traffic would move better. (Of course, suburban sprawl has led to rush hour traffic jams (stau) in Germany, but it’s still not as bad as trying to drive cross country in the US.)
As for this plan, they need to go past Killeen to tie into 10 or 20 and add Bliss, and then go east from Benning to add in Fort Gordon, and tie to I-20 (Fort Jackson).
Then they’d have a straight shot cross country from Bliss to Jackson, with the only urban congestion in Columbus and Augusta. (The Columbus - Augusta link could swing through Warner Robbins, if desired).
The route would be a bit north of Polk, and pass near Camp Shelby.