We have driven down three times from jersey, the first time the kids were 10 weeks, almost 2, and almost 3, they were amazing, we got to the exit before you get out of georiga (so about 3-4 hours away) That time we had left about 8 at night, and drove until right after lunch, we were also with another family, with a 13 week, and 2 year old.
The second time the kids were 15 months, almost 3 and 4. We left around 4 in the morning, and by 8 that night we stopped, at the exact same spot we did the first time.
The third time we drove they were 2, 4 and 5, and we left the same around 4, and got to the same exit.
My advice, is push hard that first day, the farther you get the less the second day. Getting so close, we have a good nights sleep, wake up when we want, have a great breakfast, drive a few hours and are at disney property by checkin time. The shorter second day is the key, at least for us, we sleep like the dead that night in the hotel, and by the time we get up, all refreshed, we eat, and get to disney, and 2 out of the three times we have gone to downtown disney that night.
We love the driving, we drive everywhere, my kids are awesome in the car, a few christmas's ago, we drove out to my family in Illinois, and got stuck in Ohio, in a blizzard, on the highway for 10 hours (in the same spot), and the kids never even complained, and we did not even turn on the tv until it got dark!! I get a rubbermaid, and fill it up with new stuff, new crayons, scotch tape (laugh, but they LOVE it), post it notes (hours of entertainment!!), stickers, they each get a new color wonder book, the big ones play games, snacks, they love little plastic people, and they will sit in there seats and play them for hours too. I keep bubbles in the car, have only used them once, in a pinch, but it bought us about an hour (stuck in traffic, trying to get off at an exit to get a hotel). They all have flashlights for the night, and I will get a new movie or two for the car (we netflix them). My girls also love to put blankets over there heads and pretend they are in caves.
I wish I could do a picture, last time on the way home, they asked if they could make tattos with there markers on there legs, so we said yes (who cares, it washes off). By the time it was over, they were completly blue, blue legs, blue arms, blue faces, not just scribbled, but colored in, it was hysterical!! You should of seen the looks we got when we stopped for lunch!!
We also pack a lunch, and picnic the first day at a rest stop, they get to eat, and run around for an hour or so, that makes a huge difference in how they behave.
They also like to count down the states, your oldest would like that, we tell them how many states we have to go through, and we name them all, and tell them when we get to a new one, they love that.
I say do it, nothing like a good road trip! We love to travel that way! Plan on taking the whole summer next year to drive out to california, and enjoy that ride, and everything on the way!
Good luck! It is fun!
Heidi
. Our dd(5) and ds(3) can watch their dvds on the way down for some sanity. Just wondering how other families faired at driving all the way down. We are debating on what time of day to drive. I am figuring we'll stop in SC to stay over for a night. Appreciate all feedback.
We still call him that 25 years later! We drove down with 4 boys 5 years ago, not bad they watched videos and played gameboys. We will be driving down in Oct. now with 5 boys 16,13,12,11,5 at that time! We will be stopping outside of Atlanta to stay at my in laws for a night. I don't think it will be too bad! Flying is just too expensive for 7 of us! 
