Have driven it both ways with our RV pulling our toad. It has a VERY steep grade for about 3 miles, a few miles west of LaJitas and is a mountainous road, with many low water crossings(dips) when closer to Presidio. It is a very scenic road, IMO, but just be aware, it is NOT a flat, straight, road.
Texas does have mountains and in that region, they approach 8000', so be aware it is not ALL flat, as some would make you believe.
Bob & Betsy - USN Aviation Ret'd '78 & LEO Ret'd '03 & "Oath Keeper Forever"
2005 HR Endeavor 40PRQ, '11 Silverado LT, Ex Cab 6.2L NHT 4x4, w/2017 Rzr 4-900 riding in 16+' enclosed trailer in back.Where the wheels are stopped today