The pressure treated dimensional lumber would work, and be very inexpensive. However, in the long term I think you would be better with something else. King Star Board would be great and rather than go with a very thick piece, I would consider using thinner stock and create two pieces separated by spacers of the same material. You would need to bolt or screw it together as I don’t think Star Board takes glue very well.
You could do the same with marine plywood and paint it.
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