Im planning on doing Wonderland in early Sept.
I recently talked to someone who did it this past summer and he said about half the sites would be good for hammocks, but he said it would be tough to use every night.
If you brought a mat and were prepared to go to the ground under your tarp and trekking poles you would be pretty safe.
He recommended going to the ground for the trail..(I know I know)
I have heard of backwoods permits as well but I believe you have to be something like 1/4 mile off the trail and would need the Bear Canister for sure.
Im trying to find more details on that...