Unlocking Trucks
To unlock events in the game, you must get first place in all of the races. The best way to continue winning races is to constantly update the truck you use once you unlock new ones. To get the Blacksmith, you must earn 50,000 points. You can do this by repeating levels or mini-games. Get 70,00 points to unlock the El Toro Loco. Use this truck as soon as you unlock it to win more races. Get first place in the world finals racing and freestyle to unlock the 25th anniversary version of Grave Digger. Gaining 110,000 points will unlock the Suzuki truck. Then complete the South-East challenge using Grave Digger to unlock the Iron Outlaw truck. After you receive 235,000 points to unlock the Maximum Destruction truck, complete the coastal challenge to unlock the Pastrana 199 truck.
Trophies
In this order, earn the Coastal Series trophy by getting first place in all of the coastal events and earn the Midwest Series trophy by getting first place in all of the midwest events. Earn the South East Series trophy by getting first place in all of the south east events and earn the Southern Series trophy by getting first place in all of the southern events. You will then be able to play in the World Series. Use the Pastrana 199 or Maximum Destruction truck in the final races. Earn the World Finals Freestyle trophy by getting first place in the World Finals Freestyle and earn the World Finals Racing trophy by getting first place in the World Finals Racing events.
Unlock Secret Bonus Truck
Once you have beaten everything in the game, use the Maximum Destruction truck in order to unlock the secret Incredible Hulk truck. Go into "Cash Grab" mode from the main menu and and choose the normal difficulty setting. Play each season and get the most money. Completing Season 3 unlocks the Incredible Hulk truck.