I've never felt the need for a truss rod on either Rainsong or my Blackbird Lucky 13. I couldn't tell you if the CA Cargo has a truss rod or not without digging it out to look. Emeralds come with TR's but except for a minor tweak of my recent X30, I've never touched any of them. In general you will only need to adjust the relief if you change tunings noticeably or change string gauges. As AZ said, it is good to have the option even if you never need it.
The Super OM (like all Blackbird CF instruments) is now out of production in favor of ekoa, but there are still some in stock at LA Guitar Sales when I looked last week.
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