18 campgrounds that take vehicles of 40 feet or more in Illinois

Every one of them is run by the Army Corps of Engineers. More of them sit in Lake Shelbyville than anywhere else in the state. Forrest W. Bo Wood takes the longest rig in Illinois at 150 feet.

A campground is listed when the longest permitted vehicle in its Recreation.gov site records is 40 feet or more. The figure is the longest single site, so most sites at a listed campground are shorter.