1800 miles in 3 days with 3 kids in a truck. Crazy or not

Btw concerning the OP, we drove from WI to Big Sky MT, NW side of Yellowstone, this winter with my two boys. They were 4 and just turned 2 at the time. We drove straight through, IIRC 25hrs. Did have a two hour break in Billings when my bud who was traveling with us had a mechanical issue.
We gave the boys lots of video games, movies, food, and playing I spy games to keep them busy. Of course they slept about 10 hrs too which was awesome....haha

Good luck with your trip, probably be harder with older kids.