What is the weight of 1996 mack truck 600ch600?

Anywhere from 13,000 to over 20,000 lbs., depending on specifics. Mack tended to be more focused on vocational vehicles, so the specs on their tractors can vary greatly. The wheelbase of the truck, the axle weight ratings, whether it has a single or double frame, any additional equipment (such as PTO systems), etc. will affect the tare weight of the vehicle.