There are 4 small US Forest Service campgrounds here. The access road is in great shape and while it is gravel, it is passable with any vehicle and trailer combination.
One of the campgrounds is reservable, the the others are FCFS. We stayed in the equestrian campground. In two of the campgrounds (on the left as you come in), only the smallest of trailers will work. The first one on the right is the equestrian campground and the second one on the right is the reservable campground. We have a short 5th wheel (26') and we found only a couple of sites we could fit in. I would say that 32' is about it. On the other hand, the campgrounds get very little use and you should have no problems finding a spot. We were there in early June and we had our campground to our selves. There is water but no other services. Cell service? Forget about it.
The hiking is fantastic from the campground. Trappers Lake is outstanding. There was a forest fire a few years back so the trees around the lake are gone. There are many trails and the views are some of the best.