No, it doesn’t matter, except that I think you can get oversized mattresses from lots of places, not just that one.
Edited to add that you can spend more than that on a mattress, up to $50,000.
Pictures or it dint happen.
But that produces a lot of little futons. The OP wants one big one.
I’ve heard rumors of a mystical bed that could hold eight kids and four hound dogs and a piggy that they stole from the shed 
My bed can fit 1 adult man, a koala bear, a nun, some girl named “Trixie,” 2 midgets, and a billy goat.
aka “Riding the hump”. Gotcha.
I’ve only ever done 3 bigger-than-average people in a queen-size bed. It was close quarters, but that’s what we were after. If we’d wanted a good night’s sleep, we’d have all slept in our own beds.
The mattresses can be folded. Regular king mattresses can be folded, too. Frames/boxes/supports are also multi-piece.
What, no panda?
Folded, yes, but you need three men and a truck to move them. My SIL just moved and has a king size super thick mattress that I swear weighs 5000 lbs. Even folded it barely fit through the door.
I vaguely remember hearing about one that could hold 8 children, 4 dogs and a purloined swine.