Weight support below water bed question

We have a crawl space beneath a bedroom with a waterbed. I'm thinking of wedging in a few 2x4 struts beneath the center of the bed to transfer the weight load from the rafters to the ground below.
Good idea, bad idea or what?
Thanks
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If the house is well built, it would not been needed. OTOH, if it makes you feel better, why not?
I'd use a piece of pressure treated 2 x 4 and set it atop a brick or concrete paver.
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Well, having moved a few water beds in my almost 50 years, and wondering about the same thing, I found out recently, that a waterbed actually puts less pressure on the floor than a refrigerator or freezer does, so, while your at it, don't forget the fridge.
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