I saw a mention of a Boeing C-32 and has to look it up. It’s the military version of the 757 and is available to the US Secretary of State. I imagine it has some pretty nice sleeping arrangements.
My good buddy flew it some time ago, during Bush Jr administration. His favorite airplane, and he flew C141, C5 etc.
But they are getting old. Bob Gates, former SecDef, in his book was talking about it, saying how it does not measure to AF1 in anything. It is good but far from plush.