This is the best place to be when hiking/touring Guadalupe Mts National Park, especially if you plan to hike Guadalupe Peak (the trailhead is in the parking lot). The sites are nice - some are a short walk-in, some are right next to your parking spot.
We don't RV, but the RV sites were underwhelming - it's just a parking lot with no hookups.
The restrooms were nice and clean, but no showers. This wasn't fun when you're sweaty and stinky from hiking all day. There was also a dish washing station. There's one bathroom with flush toilets, and another at the other end of the campground with vault toilets. The closest hotel, store, and restaurant are all ~30 minutes away in White's City so bring everything you need.
There's no campfires allowed (ever), plus they had a slightly increased burn ban when we were there so we couldn't use camp fuel products but I understand that you normally can use them. Good thing we had a backup butane stove.
It's a very pretty location and is a great campground, especially for being in the middle of nowhere!