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The load is mostly vertical, and the problem i can forsee is the wood being too soft/malleable to handle the load in the relatively concentrated area of the bearing. By using something like a 6061 aluminum tube, we could easily spread the load out and reduce the chance of wallering/widening the bearing holes.

We want to use hardwood because it is strong and available in boards the size/shape we need. We are looking at wood because it provides an easy way to do live axles with minimum machining. The robot in the rendering would require only basic cutting, gluing, screwing, and drilling. Not to mention it would be easier than previous chassis we have done, for a little gain in weight and simplicity.