Drove from Vegas to Huntington Beach to SF and back a few months ago.
I stopped at almost every super charger on the way.
Some favorites Yermo, Kettleman, Harris Ranch. Also Westminster has urban chargers.
More to see the travel stops, not range anxiety I could have skipped many of them.
Took a nap at a few of them. Set an alarm to wake me up when charging would be done.
Slept through the alarm in Fountain Valley. Thought I'd get some idle fees, but didn't.
Seems like most spots wouldn't mind if you take a nap, or sleep for the night. Just don't idle while sleeping.
I ended up charging in Gilroy (I think), too tired to continue driving, or even look for a hotel, can't remember the time, but it was very dark out, all other chargers empty. Pulled off the charger when it was full, and parked in a spot near the chargers. Put my seat down, barely got to sleep, and security came up in a Security pickup truck told me no sleeping. I said ok, and put my foot on the break to wake the car up. Then he got pissed and told me I had to leave. I said I was about to, as the car is booting up. He got really impatient with me said something about the parking lot owner doesn't allow sleeping and he's going to trespass me or something. He never got out of his truck. I'm sitting there thinking quit talking to me and I'll put it in reverse so I can go. I'm guessing that area might have a homeless problem and parking long term, and the policy doesn't allow for being nice about it. I didn't see any signs about overnight parking or anything. Or the guy was having a bad day, or has Security Power Trip. I forget, I think I drove off completly. But thought about going back to the super charger plugging in for a few min, just to see what the guy does.
Theres a Chevron station on Blue Diamond rd, with a chargepoint (DC Solar, free with chargepoint app). I bought some snacks, asked the guy about the trailer, he said he didn't know much. And told me to feel free to stay as long as I want. He also said he didn't know anything about billing on it. I just hooked up to it to see what the power output was, and report on plugshare.
Tldr: Most places were very welcoming. But check.