First off do not pay attention to google directions as it will take you out of the way through a wash. There is quite an easy turn off right off of highway 70 (whether heading east or west, you can turn north off the highway). Once you turnoff of the highway there is a gate that may or may not be closed so once you go through leave it how you found it. 

Follow the very manageable dirt road and there will be multiple pull out areas to camp in. The closer to the highway the more busy it is so keep driving. We found a small pull out between the two trails that take you on hike to the Spirit Arches and Petroglyphs and the other up through the wash to the pictographs. 

The hike to the pictographs is much more interesting as you enter the narrow canyon. There are several spots that are reachable by RV, but further back you’ll need high clearance and possible 4x4. 

There is no camping allowed within the canyon. At the trailhead though there are a few large areas for camping but probably easier with higher clearance. There is no bathroom, trash or water so pack in and pack out even that which you have already digested.;) 

No cell service from ATT, Verizon or TMobile, but was able to get a bar or two on Verizon with the cell booster.  Oddly we did have cell reception on the hike within the canyon.