Not sure this would work for you or not... West side o park is bounded by NF so...
afaik you are allowed to disperse camp there....
There are loads of spots along Evergreen Road on the way to HH that you can park on the
side of the road and sleepy.
Never done it.. but I'm fairly certain that is ok. You could go to Evergreen Lodge and have din din...
then drive back south and pull off to side of road and sleep.
Anyone correct me if I am mistaken... loads o people do that during the Strawberry Fest.
There are other side dirt roads further west right off of 120. Never done that either...
Good luck