Just recently ran US 90 from San Antonio to Del Rio, to Van Horn. Stayed at Langtry, and Marfa. No verizon signal most of the way. I hear the Consumer Cellular (AARP) uses all the various carriers towers and may be the best cell phone provider to have in Texas. Langtry Tx has a "self serve campground". 2 of the 5 spots appeared to be occupied by vacant units (the Bounder looked real bad). The 50 electric worked well, but we did not hook up to the water. Very quiet there. You see more Border Patrol on that road than any one else, and will go thru a permanent Bordor Partol check point. Not a lot of traffic on US 90. You will also get to see their large tethered radar blimp just west of Marfa. We spent two days parked at the Marfa lights observation area. Had no problems along the road anywhere and say nothing unusual to worry about. Spent over a week in the El Paso area and had not problems. El Paso had been rated safest city of its size in the US for the past 4 years. We also stayed one night at Mountain View RV park in Van Horn. Very nice campground ran by very nice folks.
One thing we found is that English is pretty much the second language in that area. Even found that with clerks in Walmart. Asked one where the Pet Depratment was, and she had no clue what I wanted! Depending on where you are from, you may find West Texas very differeent to what you may be use to!
Oh, Fabens got mentioned by someone before me. They forgot to tell you about the Cattleman's Steak House there. Highly recommend that you visit Cattleman's if you like steak. I got the little 1 and 1/2 pound T-bone. It was best steak I have ever had! And I have had some good ones. My DW does not eat red meat and got the grilled salmon, and declared it to be the best salmon she has ever had! It was well worth the "gamble"!!! Go, stay on the beaten path, do the Mission Trail in El Paso, stay out of dark scary places, and all will be okay.