Elevation from Champaign to Rockford (Illinois) via
Max elevation: 931 ft / 284 m Min elevation: 447 ft / 136 m Elevation change: 484 ft / 148 m
Max grade: 2.2% Min grade: -4.9% Steepness score: 14 + 492 + 1704 + 6 = 2216
Distance: 184.26 mi / 296.55 km Travel Time: 2 hours 47 mins
It looks like one possible route that might be flatter would be to go through Oak Brook, 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