I haven't seen an answer to your question, and in case you don't go back to see what's been said on that other topic:
You CANNOT camp on the salt flats where we race/pit/register/etc. There's only one access point - "Land's End" - and it is secure 24 hours a day. But once you're off the salt per se -- you can camp nearly anyplace you might want to drop anchor. At "the bend in the road" - which, you'll find, is aptly yclept, there are hundreds of acres of open land available for camping. No facilities other than some porta potties and garbage rolloffs. And lots of people and fun and noise and sometimes even (gasp!) fireworks although the BLM bans them. Don't get there and just move into a place without asking others first. Not that they'll object or have saved spaces, but if you haven't been there you won't know what parts are likely to turn to gumbo in the rain and you won't know about the rampaging mosquitoes that live in the drainage ditch. There are a couple of commercial campgrounds in town, but chances are good that they'll be full. You'll find water available at some of the fuel stations and there's free dumping of your waste water at the parking lot of the (to be built) Bonneville Museum. Groceries, restaurants, gambling, and bench racing are all available.
Does that help?