Sagging in cab-over bed area -> how bad is this?

I'm kinda lazy, so I would throw a piece of 3/4" plywood in the cab over under the bed. It looks like it's basin the middle so distributing the weigh out to the edges would help. The worst thing that would happen is you would fall through to your cab, but I doubt that'll happen.

Others will disagree, but that's my two cents.