So it means that two people can pay $60 rather than $90 (or $55 if over 62 years of age for the first driver.)
So next Calstar, I will create a spreadsheet. Once you leave, put yourself in the sheet with your ETA and number of days you plan to register for. After leaving 101, before losing cell signal, update it. Pick somebody else who will arrive later than you, "claim" them and give their name at the gate. Or, if you have been claimed by somebody, mark your acceptance, and once through the gate, find some signal and mark that it worked, and find your benefactor and give them $15/night. Or donate it to those who provide food like Dan or Randy.
(I suspect as well that they will cooperate and just ask, "Has <buddy> put <me> on the list as the second car yet? If so, great. If not, list <buddy> as my 2nd camper" and then you don't need to update the sheet, just know the name of a buddy arriving the same day as you -- you can arrive hours apart.)
Or don't bother and pay the full amount and give more to the park. Or just work it out with a specific buddy, and just set it so whichever of you gets their first lists the other. Note that this is not for people with trailers, that counts as your 2nd vehicle, I believe. Also best to pair with somebody spending the same number of nights.
I'll post an update before the spring fling for those who care to participate.