Dispursed camping is BLM managed, undeveloped land that is for unreserved, free camping, with some regulation. Here is a link to a blm doc https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.blm.gov/download/file/fid/20778&ved=2ahUKEwjh-dPRj83dAhUyHjQIHQ9hBvsQFjABegQIBxAB&usg=AOvVaw1oE2XIr5gY3OquwlIwUj2L&cshid=1537568140000
Basically just be respectful of the land, and the other people there, and you can camp for free. This specific plot of land is an old dried lake bed, so it's flat for miles. You can take pretty much any car. I took a 2007 Mitsubishi eclipse
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