The first night out we found a spot on the edge of the park. Our goal was only to get away from our Oasis, and get as close to the `Zona line as we could before dark (someday I'll do something about those lights on the Draggin').
That would let us get to the `Zona DMV early enough that we could get out of town before mid-day and put on some miles in the right direction . . . North.
I needed to get a reg on this new trailer I'm pulling, and heading East to the Colorado river (at 400' and triple digits) is the closest office.

Not too many feet away from our rigs that night was a line of "T stakes that had been driven, as a barrier, across the dirt track . . . PARK BOUNDARY. The track was now getting wider at that spot (like anything that gets dammed) . . . enough room to turn around . . . a camp space starting to happen on the edge. It's becoming an un-official trailhead.
Now most will walk from here to the hill size pile of rocks that the track went to before the damming, . . . others won't, they'll make a way around. Of course they may have been here since before the Park was a park and have been driving out here for most of their lives, . . . hard to know.
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The next day the Draggin' started a little weak. Watching the gauges on the way to the river caused a bit of concern . . . he didn't seem to be charging.
After some "hoop jumping" and some "paper signing" at the DMV, they gave me a paper tag. ". . . put it in a freezer ziplock and tape it to the rear . . ." RIGHT!
I stored it safely in the map box, and while we were at it we plotted a route, had some food, and got ready for a day of driving.
Firing up the Draggin' brought the sound of a diesel turning over way to slow . . . damn. Two trucks pulling two trailers, and where's my multi-meter? Right . . . not w/ us.
So now the plan changes to " find a good site, to our north but NOT too far from parts stores, to be broke-down".