You are reading a single comment by @chiroshi and its replies.
Click here to read the full conversation.
chiroshi-
Our current one (from Made I think and probably bought in winter 2018) had a leg in the middle underneath a metal supporting beam. The bed was dragged by my father in law when he, uninvited, decided to look at a plug socket behind it. The middle leg snapped. He didn't mention it. When I sat on it a bit too heavily the bed frame cracked. In fairness I weigh a lot more than I did at 23 but still. My ambition is a rock fucking solid bed that I can throw myself onto from time to time - so think a diagonal and downward force. And importantly one that doesn't squeak at the slightest tremor and one I can mount without having to spread my weight like I'm crossing quicksand for fear of it collapsing.
CYOA
Same reason as ovalised seat stays.
Wide timbers will resist movement in a direction that is not relevant to a bed.
Your challenge will be the strength of any mattress support whether that is slats or a sheet of plywood.