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To be more specific, as far as I can tell by the grain size, it's red oak, although white oak would be more durable, but tends to warp more. Green or air dried oak will eat hardware real quick because of an acid in the wood. Use kiln dried if possible.
I used (black) locust as a replacement...
The bed is designed to move with respect to the frame and the wood serves as a "gasket" of sorts.
The ones I have worked on, including the dromedary platform of the xm757, were made of oak and have held up well after all these decades...usually 3/4 inch thick.
Edit: Wood is not a "bad" material...