I think i would just keep plugshare's filter narrowed down to CCS/SAE at 50kW minimum power and call it good. If needing it in a pinch, zero out the power minimum and include Tesla destination chargers and J1772 plugs.Keep in mind plugshare is also crowd sourced. In addition to partnerships with all those networks they also rely on people reporting charge stations.
This means that you'll find odd stations like a store owner installing his/her own Clipper Creek charger for customers that isn't networked in plugshare that you won't find anywhere else. Or the many plugs found on lightpoles in parking lots.
In addition to that: Plug share users can list their own house if they wish to be generous (or a rescue for someone who is in dire need of a charge).
Having driven a car with a plug for 7 years now: The plugshare app is my go to app for finding charge stations. Nothing else has been as reliable.
I don't think there's a CCS plug within 250 miles of Mt. Rushmore.All the places you mention have a plethora of J1772 plugs around them. Easy peasy.
Mt. Rushmore has 3 J1772's right at the monument (and 3 Tesla destination chargers).
A few years ago we had a rented Bolt and charged up at the Redwoods north of San Francisco.