We stayed at this campground may years ago (2006-2008) and it has remained one of our favorites.
Our most recent stay was for a small rally of 8 class A RVs from 34' to 43' in length all with tow vehicles. Wishon was able to accommodate all of us. The drive to Wishon starts with a long climb to Shaver Lake. Past Shaver Lake the road becomes windy for the remainder of the drive. Expect at least a 40+ minute drive from the Shaver lake turn off. On the way you will pass a grove of Giant Sequoia trees with a pull out to walk or picnic among them.
All sites are gravel and have full hook ups. Some sites have 50 amp service but it will rarely be needed because of the elevation of 6800 feet. All sites will accommodate the RV, vehicle, boat, and more. Wishon also has tent sites with or without platforms.
There are many activities available from this campground. Hiking, mountain bike riding, Jeep trails (Dusy-Ershim Trail), and fishing. Two reservoirs are nearby, Wishon and Courtright. Courtright at 8200' opens later than Wishon at 6600'. Rainbow and German Browns can be caught.
Wishon Village has a nice store with most necessities and sells fishing licenses.