I Have been to the dunes (sand mountain/little sahara) many many times over the last 10+ years with my bro and his friends from Mequiet, unless it has changed from two years a go( the last time the G rangers pulled us over) all the rangers asked for was proof that they lived in Nevada(drivers lisence). and your right about california, they had to get temp regs for the dumont trips. On one trip i was ridding my bros bike and got pulled over, i had a utah driveres licnce but could not prove who owned the bike (nevada, no registration requierd) it just about got impounded.