Heavy, and supporting the floor as that surface area become larger becomes increasingly difficult.Now my youngest son has jumped onboard and is currently in his room drawing a sketch of a coop where the bottom is on hinges and can be dropped open to dump the contents onto a tarp for cleaning. Pretty smart but makes me nervous. Is there already such a thing?
What most with raised coops do is set the floor height above the height of their wheelbarrow, then make a hinged opening on one wall at the floor level, close to the full width of the wall that they can open up and secure in place via clasp, etc.
Open the "door", roll the wheelbarrow up, grabe the rake, and pull the spent bedding into the wheelbarrow. Close "door" and cart off. A bow rake works best.