I hope you really plan this trip thoroughly not desperately. You can get lost and there are sections where there will be no one around for miles and miles to come help.
You can camp anywhere within the Preserve as long as you stay out of site of the main roads. You must use existing fire rings or bring your own container.
Are you camping the night before you leave, staying in a hotel in Laughlin or driving in the same day?
Are you doing a 2 or 3 day run?
Are you sticking to the Mojave Road only?
Either way Beale Mt. is a regular stop for many. It located on the fringe of Mojave Trail just east of Marl Springs 6.14 miles NW of Kelso Cima Road. I can give you coordinates for it. Because of the small size and shape of the mountain you can move around it depending on conditions and hide from just about any wind angle.
Caruthers Canyon is off the trail but very scenic.
There are some cool over look sites off Aiken Mine road up on the side of several cinder cones, very desolate but insane views.
17 mile point is another regular stop and is 1.8 miles past the intersection of Kelbaker and the Mojave Road (AKA Old Government Road and sometimes Cedar road)
You can pretty much camp where you feel like it and not worry about anything. A few days ago I saw a couple camped out in the corral next to Aiken Mine Road, I guess they felt safe inside it?
I can email you a list of GPS coordinates. I also have a really good KMZ file for Google Earth and a GPX file for your GPS.
Let me know.