Feiltrip, are you there now or when you will be going might make a difference.
Pla-Mar cg in Bremen is very good, and just down the road on Hwy 6 from Newmar.
The only cg I found in the Chicago area was Windy City on the south Side, off hwy 80 just east of Joliet. They are open year round we stayed there last March, very cold and snowy.
It is convient to all the connections of all the freeways. I do not know what is north or north west.
2001 Travel Supreme 36'
Tow 2001 PT Cruiser