Do most state parks have a 30-foot length limit?

If you go to Reserve America and search Patrick's Point State Park you will see many space length listed at 24 feet. Others with no length noted. We stayed at a space noted with a 24 foot length and my truck and 5er both fit with no problem. They may have noted that length because of the maneuvering required to get there. I used the photos supplied to see for myself if I would fit. Too bad not all parks post pics of the site.