I think 2 is about what I was anticipating for most locations. My biggest concern is over whether people will end up plugging in and then going on a 5 hour hike, when they only needed 30 minutes of charging. I'm not sure there's any way to prevent that type of thing happening, and that would drastically reduce the throughput on the stations.
I would assume the choice to only do 2 is not due a financial limitation, but if it were I'd rather see 2 spaces in 500 stations than 4 spaces in 250 stations, especially since I don't live in Colorado. This does give me a lot of hope that Washington will get a good number of adventure chargers though, since we've also got a very active outdoors scene.