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

Not entirely crazy ... but maybe... :) In Sept we're headed to Glacier Nat'l Park from Illinois, but we'll stop for a couple of days in ND in Theodore Roosevelt Nat'l Park to see the bison (since we're leaving from Illinois, we're also headed to SD and Badlands, Custer State Park & Wind Cave Nat'l Park first, but those aren't in your path from MI). Youing may want to think about break it up, plan on spending a few less days in Yellowstone area and a few more enroute at cool places like TRNP. Good Luck & ENJOY!