Earlier quoted context omitted.
Good explanation. Checking the map in the southeast is pretty sparse though.
Which part of the southeast are you looking at? If "the southeast" comprises NC, SC, GA, FL, AL, MS, and TN, then the only sparse areas are northern AL and MS and western TN, and northern AL and western TN have sites under construction which will probably be done in a month or two.
I could round trip Columbia in a Tesla. I could make it to Florence with about 90 miles left but I'd have to get somewhere that I could charge for 22 hours to get enough juice to get back (per the 4 miles per charging hour on the Tesla site for a new standard outlet).
Assuming that 270 mile range was accurate Murrell's Inlet would be doable at 260 miles just barely but then I'm still looking at 67.5 hours wait to charge enough to get back.
EDIT: Just as a side comment, Columbia really seems like a place where they need one since it's the center point to so many routes in the state.