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Charging at a campsite in Zion National Park last week using a TT-30 adapter:
Two nights of charging at 24 A, 120 V (~7 miles/hr) easily gave me 90% and that was plenty to get back to the Beaver UT Supercharging Station. Zion also has two J1772 EVSEs at each Visitor's Center; the cost is $5 for three days of use. I'd have bought charging access just to show support for the program but the line in the Visitor's Center, the only time I was there when it was open, was too long; the rest of the time I was there after or before it was open. For most of the year Zion uses shuttle buses in the Zion Canyon area, which work well. No cars, no traffic, no hassles.
I happened to be seated at the same table as the public works guy who did this, at a seminar over the winter. We had a good discussion about EV's and he was clearly a supporter. So was the guy next to him, who was responsible for the Greenwood installation! And the Midway guy was very proud of the way he installed this one! Justifiably so, it's pretty good IMHO!
I use bungee cords to hold the adapter in place to the pedestal. Many National Park campgrounds have only "30 amp" (120 volt, 30 amp TT-30) service — if they have any electrical hookups at all — as opposed to the 14-50 outlets common at typical RV parks. (The car charging system has to be set to 24 amps since the non-Tesla adapter doesn't automatically limit current.)
At the campground in Zion National Park using TT-30 adapter.