In one of the images from the Twitter post above, from Australian journalist Belinda Seeney, we can see one of the weapons Hulk wields in the trailer on a table next to the bed, which gives us a bit of scale for the bed.
Of course, the image of the Hulk sleeping is itself a fairly difficult image to conjure.
The bed is currently on display at the Gallery of Modern Art in Queensland, Australia as part of the Marvel: Creating the Cinematic Universe show.
It would have to be to be big enough for the Hulk to sleep in it.