You're right! I *could* make it with just one stop, but that means I'd have to leave Charlestown with an absolute full charge, since the first stop is Kingsland, GA, 210 miles from Charlestown. That's cutting it really close charge wise, but doable (many factors influence maximum distance-rain, weather, traffic, hills, etc). And once I get there, it's a long stop to recharge again to almost full to get to Traveres with some charge left, since there is no high-powered DC charger there, so I wouldn't want to arrive with very little left.
But thinking more about it, what I might do is two stops instead of four: Savannah (airport), and St. Augustine (mall) (see image). That balances out both the distance and arrival charging issues. When making long trips like this, the general idea is to stop more often for shorter charging stops, as opposed to stretch it out as much as possible and make longer charging stops. I can explain it also better in person, but the longer stops take longer because (I'd guess you know this) with Li-ion batteries the charging tapers significantly once they're over 80%.. so to go from 0% to 70% takes 30 minutes.. but that last 30% could take an hour. So the idea is to only charge as much as you need to get to the next charger, plus a small buffer (15%-25%).. Stops like that are usually 20 minutes or less. In these cases, the battery gets quickly charged to 60%-75% and avoid the taper all together.
Now for those of you saying "gah, what a pain in the ass to figure out all this and plan ahead where to stop and for how long, and it adds so much time for the trip!!" --- all I can say is: I'm not paying one cent for the energy to get there.