Veer right at BLM main info sign for free camping
This campground is primarily used by mountain bikers. $10 a night. Very close together and small sites, so no big RVs will fit. If you veer to the right at the main BLM info sign, on road Q .5, or something like that, there is plenty of wide open and free BLM camping. 
Sitedispersed
Month of VisitMay