According to the website, most spaces will fit a 35ft rig. I think there are a few that may accommodate a 40 ft. rig. The only problem is that the campground is first come, first serve so it would be a bummer to get there and find out otherwise. https://monocounty.ca.gov/sites/default/files/fileattachments/public_works_-_facilities/page/10202/lundycanyoncampgroundinfo-july2014.pdf