I'll driven that stretch of I-10 going East to West in a Model Y LR. Anyone traveling west of San Antonio, everyone should plan to stop at almost every supercharger between there and Tucson, just to be safe. (There are 2 in El Paso and 2 in Van Horn now, so you can stop at only one each of those places.)
If you're going to Dallas, you'd take I-20 where it splits from I-10 in West Texas. You'd still need to stop at all the first few superchargers on (-20, but as you get closer to DFW, the superchargers get much closer together.
To make you feel more comfortable with this trip, try mapping it in A Better Route Planner.