I'm also making an assumption that Toyota is behind the curve, it could just be a temporary situation because of a demand spike. I am on the list from Helm when they come back in stock and so the list may just be growing until they get enough on it to do a print run. Toyota is all about just in time, so no sense printing a bunch of 2-inch thick manuals that will just sit on the shelf for 5 years. My guess is most dealerships have the manuals as electronic files and it's just knuckleheads who still want printed manuals.
'91 Toyota Pickup
'09 Kawasaki KLR650
'12 Gunnar Rockhound 29
"To live is to suffer, to survive is to find some meaning in the suffering." -- Friedrich Nietzsche