Max elevation: 1042 ft / 318 m Min elevation: 582 ft / 178 m Elevation change: 460 ft / 140 m
Max grade: 1.4% Min grade: -1.8% Steepness score: 14 + 180 + 1107 + 9 = 1311
Distance: 282.7 mi / 454.96 km Travel Time: 4 hours 19 mins
It looks like one possible route that might be flatter would be to go through Put in Bay, but make sure you double check everything if you're planning a road trip.
Elevation data comes from different sources and may not reflect true
driving conditions, so talk to other RVers if you're concerned about
steep grades. If you're planning to drive in the winter and you want to avoid snow, check the road conditions from Chicago to Detroit. You can also view a 3-D map of Chicago elevation or Detroit elevation.
These are some of the possible highways along this route. Use the GPS in your car to verify all driving directions. If you're looking for campgrounds along the way, search for RV parks between Chicago and Detroit.