I have stayed at the Anza-Borrego Desert State Park - Borrego Palm Canyon Campground. Spaces 49-52 are the best. Nice relaxing park, close to town.
But, also remember that the park is adjacent to a lot of BLM land if you want to boondock.
Added: HWH Kick-Down Leveler; RoadMaster Anti-sway bars; Tornado Rotary Tank Rinser; Accede Backup Sensor Kit; cylinder locks (w/one combo lock); custom sink cover; Kenwood DDX 5706S front radio; Pioneer MVH-X5560BT rear radio; Oxygenics Shower head; ScanGuage II; Blue Ox Tow Bar w/RVi Brake 2; Winegard Rayzar Automatic TV antenna; Trimark Steel door lock; Dometic 310 toilet; whatever is next.