Well, I've never heard of an enlarger bigger than 11x14 inch, and I've only heard of half a dozen of those.
Who else has tried handling seriously large format? It's evil stuff. Not dinky sizes like 10x8 inch: that's easy. But even 12x15 inch (the biggest I've ever handled) is not just as slippery as wet fish: I'll swear it jumps like live fish too.
And in our séjour there's a portrait of Frances and me on 20x24 inch Polaroid, from the Great Camera of Prague.