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Cypress is used a good deal here on the South Coast.

I'm surprised your wood is failing so quickly. Is it possible you're using the wrong carpet type? Is the carpet drying quickly? Usually the carpet used on trailer bunks drys quickly. Carpet that retains water and prevents the bubks from drying well will promote rot.

You may want to consider using the Slick Sticks or similar on your bunks and eliminate the carpet.