A.S.
It wasn't quite as far and only one little one (I have 2, but only 1 went with me), but I went on a trip with only my son, who at the time was around the 18mo mark. I had LOTS of snacks, lunch stuff, a cooler full of fruit, lots of new toys ($1 store type stuff), beverages, doodle pads, and we had to stop often. Our 1st stop was in Reading, PA to visit friends. Then we went to (near Boston) MA to visit more friends. But we went from MA all the way back here to just south of Detroit in one shot... That was a 14hr trip (incl. stops). He did way better than I expected! However, he didn't want to get back into our car for about a week once we got back!
It was just my son and I.
Good luck!