Here is my thought. I'm not a transportation manager though.
Idaho has 5,000 miles of highway. A charger every 100 miles would require 50 chargers. (Every 50 may be more realistic)
The cost of chargers only is 7.5 million per your cost. That doesn't include the land lease or maintenance and other things. They would need to be secured somehow also.
I would put fast chargers at the police stations and some kind of quick-disconnect version of a J1772 at the locations they typically park to monitor the roads. That way they could sit charging with aircon running and all their systems on and if there's something to respond to they could just drop into drive and hit the throttle. No need to get out of the car. Supposedly the J1772 standard goes over 19kw, though the most I've ever seen is 11.5kw. Those types of locations could be little gravel pads at all the exits / overpasses / median turnarounds / etc. And their install cost could be $10K instead of $150K.