We have parked for a few days to visit family at the Rochelle , Il . sky diving center in nov. '17. Full hookups, self serve. Its not well marked and easy to miss the entrance, but there is a truck repair, service place with u turn room just past.
Recommend a call ahead to confirm availability and a look on google earth and maps to find it first try.
Its called Chicagoland Sky diving Center. Good dog walking room, big parking lot if you have to dry camp. Recommend you patronize the restaurant