Free dispersed camping, about 20 miles outside of Quartzsite, with no services available, but lots of space and beautiful views of surrounding mountains. The major drawback is that you can hear the traffic on Interstate 10. We stayed here for just one night, as we were approaching Quartzsite at dusk and didn’t want to mess with finding a spot in the midst of the crowds after dark. It was a nice, easy stop for the night and put us within 30 minutes of town.
Check out this article for more info about the Quartzsite region: https://thedyrt.com/magazine/local/rv-campers-guide-quartzsite-az/