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overheating on 2005 Chevrolet Express 3500

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
overheated after a 3 hr trip last night, expansion tank is empty, still some anti freeze in the radiator. I've owned it for 2 yrs. and have occasionally smelled anti freeze but have found no evidence of a leak. No steam/smell from tail pipe either.
(1) Answer
I would get your car's cooling system really inspected, you have either have a leak or the engine is consuming it, both of which need repair.