Planning a nationwide tour by renting an electric vehicle through Socar

Seoul -> Sokcho -> Gyeongju -> Busan -> Haenam
-> Gwangju -> Buyeo -> Return to Seoul
This is the route I'm thinking of, and since I expect to drive about 1,500km, I plan to rent an electric vehicle via Socar instead of using my own car. I intend to finish everything in 3 days and 2 nights, but that might be a bit intense, right? I plan to car camp for both nights.