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

We plan to do NH to Yellowstone next summer with a 10, 12 and 15 year old in the backseat of the truck. It will be done over 18 days. We did a 3,000 mile round trip last Summer and the kids were fine. Always had something to look forward to and they pulled it together for the full 14 days. Obviously more driving this time but those first couple of days the plan is to put on as many miles as possible. I don't mind driving and it is important to us to get these trips done as the kids are getting older real fast.