I built both of my Murphy beds. Both have a Queen size standard mattress in them, and are very comfortable. No issues with the mechanism. Murphy beds typically have one of two mechanisms in them for lifting - pistons or springs. For pistons, the amount of weight that can be handled is based on mount points for the piston on the attachment plate. The piston can be simply moved for more or less weight. For springs, it's based on the number of springs. I have one of each, and would go with the piston with both if I had to do it over again.
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