Rope with anchor bolts into the caliche/gravel/dirt. I haven't used it but the project owner's manager reported that it was easy and inexpensive to install and easy to change the unit mix simply by adding, subtracting or moving the ropes.
The property where it was used is Argyle Storage Co. on Hwy 377 just south of Denton. Danny Cunningham of M&M has it for sale.
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for space boundaries / lane markers: bury old tires, standing upright, so only about 6" height is exposed. No damage if driven over. Will not rot or weather. You can paint the exposed tread a bright color o leave black / unpainted (which contrast well on caliche lots.
For numbering spaces, cut the number out (like a stencil) in the upper half of a black truck mud flap. Place it over a white (or other color) mud flap and bury the paired lower halves. They're stiff enough to stand up so the number can be easily seen, yet flexible if run over. Like an old tire tire, they practically last forever in weather /sun exposure.
In addition to a self storage facility, I own an engine re-manufacturing plant, where we use mud-flaps for flexible liners in very abrasive cleaning machines - they out-perform everything on the market.
here's a link from a quick google search: www.raneystruckparts.com/24-x-30-color-polyguard-mud-flaps/?gclid=Cj0KCQiA5OuNBhCRARIsACgaiqU8dI3G0zgP3Ka0qk19HD5fvgAwa-htDjAm7V1BTLNAHCklZG-zGQ0aArzQEALw_wcB
595 Round Rock West Drive, Ste. 503Round Rock, TX firstname.lastname@example.org