NO, not all sites 21 foot limit. But very few "oversize" sites. Heart O Hills; I wouldn't take 40 ft into of some loops. Most of the places you are asking about have private parks close by for any size. Not exactly "camping" 10 feet from neighbor but you can take your toad to see NF. See
http://www.youtube.com/watch?v=XfleLjZ3fd8 typical about the places your asking about, matter of fact filmed up here. Not all have 21 foot limit some have a few bigger sites but you might need reservations well in advance.
Kalaloch; We don't even stop there during summer, to many beach/sunset worshipers that love that place. I see why they love it, but we don't like to make reservations so we by-pass Kalaloch during summer months. RV reviews would put you on to private parks close to NF.
(Sort of funny) my kids in So Cal asks "if your going to get a MH why not get the biggest you can afford"? I explain that our 26 bumper to bumper is sure tiny in his land of big RV's, but ours fits into just about anything up here.
