May I narrow my initial query, & request comments regarding ‘camping-avoidance’ through the western 1/2 of the Northern Tier? Or is it time to invest in canvass & a fat back-wheel?
Actually in the USA its much, much, much easier to find motels everywhere in the EASTERN half of the country. Its the western part where you may need the camping gear. In the east the towns are plentiful and close together. In the west its miles and miles and miles between the tiniest of little towns. So your plan is exactly opposite of what it needs to be. Motel the eastern half, say from Iowa-Minnesota-Missouri east. And camp from North-South-Dakota-Nebraska-Kansas west.