On the first hip, it was snowing and raining and we drove about 7 hours at 36 hours after surgery. I sat in the front passenger side of a Mazda MPV. Seat was hard, but with pillows, ice, and frequent stops it wasn't too bad. The second hip, about 11 days ago, we drove the same time frame at 29 hours after surgery, sunny drive, but lots of traffic. It was actually a lot better, mostly because the hip itself was not as messed up. I would definitely practice getting in and out of the car, pillowing and such while trying to not use your operated leg. I found that doing some of those activities, like walking with a cane,.... pre-op helped my brain get set to those same movements post-op. Certainly the pain and stiffness post-op will direct you, but I do think it helps to get the motions planned out. Getting in and out of the van at stops on the highway, was definitely challenging.
Maybe a train from NY to SC? train is nice for being able to get up and crutch around a little. Sadly, the car will probably be much cheaper.
BTW - don't let my surgeon know, but I drove 12 hours yesterday at 11 days post-op (RBHR), (14 days is my surgeon's recommended recovery period before driving so it's not that far off). I was able to move my right foot comfortably and fast from brake to accel. I wouldn't have done it if I didn't feel safe with braking. Last hip, I was still on crutches at 11 days and would never have been able to drive at this point.