Activate the following cheats by entering the corresponding command line parameter:

CHEAT FUNCTION - COMMAND LINE PARAMETER
Other trucks have no A.I. - NOAI
Skip user interface and go directly to action - SKIPUI
Go to truck selection - TRUCK
Go to world selection - WORLD
Windowed mode - WINDOWED

Unlock the following trophies by performing the corresponding tasks:

TROPHY - HOW TO UNLOCK
Coastal Series trophy - Win first place in all Coastal events.
Midwest Series trophy - Win first place in all Midwest events.
South East Series trophy - Win first place in all South East events.
Southern Series trophy - Win first place in all Southern events.
World Finals Freestyle trophy - Win first place in World Finals Freestyle.
World Finals Racing trophy - Win first place in World Finals Racing. 

Unlock the following trucks by performing the corresponding tasks:

TRUCK - HOW TO UNLOCK
Avenger - Get first place in all events.
Blacksmith - Collect 50,000 Monster Points.
Destroyer - Collect 10,000 Monster Points.
El Toro Loco - Collect 70,000 Monster Points.
Grave Digger 25th Anniversary - Win Las Vegas.
Iron Outlaw - Get first place in all events.
Maximum Destruction - Collect 235,000 Monster Points.
Monster Mutt Dalmation - Get first place in all events.
Pastrana 199 - Get first place in all events.
Suzuki - Collect 110,000 Monster Points.