Move over Hummer, the monster truck is coming.

General Motors Corp.'s uber-sport utility, the Hummer, has been the biggest and baddest passenger truck on the US market to date, but it may soon be getting some outsized competition in the form of the CXT.

Modeled after commercial haulage trucks and dump trucks, the CXT will be the world's biggest production pick-up truck when it goes on sale later this year, its makers said Monday.