Its been a few years but have used the "pass" for 1/2 off at Twin Lakes Mammoth and the NPS camp in the town of Mammoth(can't think of the name off hand). I drove through one NPS CG over near June Lake loop and they certainly has some sites suitable for you (Oh Ridge/Pine Lake). Im fairly sure the Silver Lake CG's have large enough sites also. Have Fun...
96 Vogue Prima Vista
The Kid's: Humphrie, the Mini Schnauzer and Georgie,wire haired dachshund.
Rainbow Bridge: Laddie,Scoutie,Katie,Cooper,Kodie,Rubie,Maggie, Cassie, Mollie, Elvis, Potter and Rosie Love You! (40+ years in all)