I just want to let you guys know that the Riverside County Fairgrounds are now offering RV camping during the festival. It's about 3 1/2 miles away so not too far.

INFO:
Riverside County Fairgrounds
RV Camping
(3.5 miles to festival)
82-503 HWY 111
Indio, CA 92201
855-611-Fest
2012 RV camping $400 for the weekend.
18+, festival wristband required.