Carbon is strong but fragile, if that makes any sense. It is strong for what it was designed for, but knicks and scratches that utility and commuting bikes often endure in their daily life can severely weaken carbon fiber. And when it fails, it fails without warning. Aluminum and steel are more practical for commuting and utility riding.
I agree with those recommending a steel touring bike that can support your weight and racks for stuff. Best of luck!