Agreed that Friday evening around Chicago is a bear. However, it is what it is. If you don't want to stop overnight before you get there and continue on Saturday (not a lot of good CG choices available for just a Friday night in that area, as all will be full with weekend campers), you can tough it out and take I-39 north, as already suggested. If you want to stay on 80 through Iowa, you can head north on I-29 from the Council Bluffs area. We've driven the I-39 to I-90 and the I-80 routes many times as well. If you need some CG suggestions, feel free to ask!