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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-
FWIW, I made my bed from 2 layers of 18mm birch ply about 20cm wide, with a 2x4 screwed to the inside to support the slats. Each of the 5 legs are about 60mm square, there's another 2x4 running down the middle of the slats (for the 5th leg) and I put a small triangle brace in each corner to prevent racking or twisting. It's all held together with 3mm wood screws so that it can be easily disassembled. 10years later it's still rock solid.
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I have always been heavy. ms_com once pushed me over for bants when I was putting my socks on, went straight through the shitty pine bed in our then rental. I broke another bed at uni, because reasons, the corner leg snapped off. Propped it up with what I could find in an unfamiliar flat at 3am, which happened to be two upturned frying pans stacked on top of each other. Not sure if it was properly repaired.
chiroshi
stevo_com
This is the reason I ended up making a 5-legged bed.