We stayed at Cabin Flat several years ago, and it's one of the most difficult campgrounds to reach near Wrightwood in the Angeles National Forest. To get here, you need to take the Blue Ridge Trail Road from Inspiration Point off of Highway 2. This road is closed during the winter, as it traverses through Mountain High Ski Resort. That said, the campground itself is very basic. I would not recommend bringing an RV here as the dirt road to get down is winding and bumpy. Tent camping only.