Well, Dad drove through the night on Friday and they made it to St. Louis. Mom took over for a few hours and got them across Missouri, but not before their engine failed to start in the drive-through lane of a Steak 'n Shake. They managed to push the Excursion, trailer and car-top bubble out of the way until they got a jump. I guess Dad earned a few hours' rest. Unfortunately for him, Mom started feeling sleepy fairly soon, so he had to take over again. They headed up toward South Dakota and stopped and got a campsite at Newton Hills State Park, about 20 miles south of Sioux Falls. They were able to get in some solid sleeping and hot showers. From Sioux Falls it's almost 850 miles on I-90 to reach Bozeman. Hopefully they'll be there fairly soon.