jose
I find this question a little confusing - though I think you are in the best forum to ask it
There are 2 recognised campsites at the bottom end of Lake Peddar.
One is next to the Lake Edgar Dam and is called the Edgar Campground, the other is "next" (very close to) to Scotts Peak Dam and is called the Huon Campground.
I am working from memory, but I am not sure if the Huon Campground was always called that. I have always thought of it as the "Scotts Peak" campground - and perhaps the naming is a source of confusion.
Edgar is a large and open camping ground with several day-huts, bins, wood and fire places and a large toilet building (still only drop toilets).
It is popular with those boating or generally chilling out, but is where we have stayed when down there to bushwalk.
If you have a vehicle, it would be my choice.
Houn consists of quite a number of smaller camp areas embedded in the forest and has a basic toilet. It all appears to be very good camping ground (ie not boggy), but I don't know if there would be issues during heavy rain.
It has the main car park next to it, which is also the start of track to the Western Arthurs - so if you camp anywhere else, you will still probably need to come here to start the walk.
The only other place anywhere nearby with toilets is the Condiminium Creek carpark - with camping next to the creek. But that is a long way from Scott's Peak.
All the best
Brian