133 campgrounds that take vehicles of 40 feet or more in Colorado

The Forest Service runs most of them. Arapaho & Roosevelt National Forests Pawnee NG and White River National Forest hold more of them than anywhere else in the state. Island Lake Campground takes the longest rig in Colorado at 140 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.