We too parked our RV here but did not stay in it. We parked it here for five nights while we visited our son & daughter-in-law who live in Wrigleyville. I have to say that we were a bit nervous leaving it in this lot even though you pass through a guard station to get into it. When we pulled in, the lot was about 80% full with truck trailers. We parked between a few trailers and hoped for the best when we came back, 5 days later. We were the only RV in the lot that we could see. All was fine when we returned. I have to say, I'm not sure I would have felt comfortable actually camping in this lot. Unfortunately the closest other place we found near our kids was 65 miles away. Chicago is not an RV friendly town! We camped here in a Motorhome.
I want to post this place to boon dock because it is so close to downtown Chicago and very inexpensive. Be sure to call the yard and get detailed directions as there are low bridges in the area. This is the Marshalling yard for McCormick place but they allow RVers to stay there. There are NO hookups and NO dump. But a great place to stay boon docking. Operated by the City of Chicago. 24/7 security. We camped here in a Motorhome.