Knowing the location of charging stations is one thing. Knowing their current status is another really important data point. There's nothing like driving 10 miles out of your way in unfamiliar territory only to find out that the charger is broken, or occupied for the next 4 hrs.
BG, this sort of thing has become MUCH less of a problem in my experience. The new stations (along say I-95) usually have 4-10 stalls (making it more likely that one or two offline stations are not a problem) and this means congestion is less of a problem (I have never had to wait, even when there were 4-5 other vehicles there already charging). Also, a lot of the new vehicles charge at 150kW or higher, and are stopping for just 20 minutes or even less.
Also, there are plenty of stations within a couple miles of the route. Oddly, the stations at the rest areas on 95 (in New Jersey) are older, slower and smaller. I usually drive 2 miles off 95 to a Walmart that has a huge bank of new chargers.
When I did this one Sunday evening, it was a 'party' of a dozen different high-end EV's and their owners hanging out and eyeing each others' hot rods like something out of American Graffiti.
Three tricks I have learned:
1. All DCFC take credit cards. But do NOT use a credit card. Many of the (unattended) readers have been hacked and your number will be stolen. Use the network app on your phone to pay.
2. Sometimes a unit is offline, and the app will tell you that, but the unit itself will not (there is no attendant to put a sign on it). I have seen people pull up to a (offline) unit plug in, get frustrated, etc. And then I tell them the app says its off line. Check the app.
3. Sometimes a unit will be working, but will only charge at 25 kW or so. Just switch units or the cable on the unit you're on if it has two. These cables (for 150 or 300 kW) are liquid cooled. If the coolant flow is blocked, the unit derates to 25 kW. This is better than 0 kW and keeps a user from getting stranded (so you can see why they do that), but not what you need.
EBS-P will be using Tesla stations, so I suspect none of this will be an issue.