Great location if you want to explore Devil's Tower and hike around. A short drive past the entrance of the park is this convenient first come first serve campground. 

The campground has 2 loops with all pull through gravel sites which vary in degree of levelness. 35 foot max RV length. There is no privacy but everyone there was really nice and neighbors chatted with each other. Lots of trees and some sites are shadier than others and some have amazing views of Devil's Tower. There are no hook ups and despite most of the sites being taken by RVs there was very minimal generator noise which is always a welcome surprise.

Each site had a fire pit though no fires allowed at the time we were there and signs posted and pits were taped off reminding you not to start a fire. There was also picnic tables at each site as well. Flush toilets, garbage and recycling as well as drinking water available. You can access hiking to the trails around the tower from this campground. 

Also near the campground is Prairie Dog Town where you can watch these cute critters pop in an out of their holes and run about screaming. Do not try to feed or touch them. They do not want to be in your selfie nor do they want to be your friend. 

You can walk a trail from the campground and a short distance on the road back over the bridge out the entrance gate to the 2 stores just outside the park. One is KOA run and had a cafe as well. Both had some camping supplies and souvenirs as well as beer:).

Decent cell coverage from ATT, Verizon and Tmobile