I did a recon on the boondocking sites in the Lake Tahoe area, area. GPS coordinates and maps for for Luther Pass, West Walker River, and Tahoe Rim below.
Before driving into any of these areas, check it out first! The terrain around Tahoe can be very rough, and not suitable for RVs.
Luther Pass Rd: GPS: 38.79 -120.0002
West Walker River Dispersed: GPS: 38.7659 -119.9418
Tahoe Rim Trail: GPS: 39.0891 -119.8974