I am looking for the type that sits on a bed, sorry about that.
Mike Berger wrote:
It's not clear if he was looking for a bed tray that sits on
the bed (just a platform with two sides) or the wheeled kind
that overhangs the bed.

N Hurst wrote:
From what I remember from designs in the hospitals I've seen, the main
important design element is to make sure that the casters are directly
below the tray, to prevent the thing from tipping over.

-Nathan