Stopped on a Sunday evening during a westbound cross country journey. Our 20’ van had no issues circling the road to find an open First-come-first-served spot, but would advise not much longer of a rig. We had to figure out the rules for finding and paying for an open spot, but it was all fine. This is a popular campground with many sites reserved far in advance, so last-minute FCFS openings on weekends may be rare.