Go to the main menu and press Right, Right, Left, Square, Up, l2, L2, R1
Get Monster Truck
Use single race mode and the hard difficulty to finish all 36 tracks to unlock the monster truck
Pro class Veichles, Unlimited
Finish all nine tracks in single race for pro class. Then the next eighteen for unlimited class
Get Unlimited Class Trucks
use single race mode and finish the first 27 tracks
Get Dodge T-Rex
In the Power division finish the 4th season of career mode
Get Rod Hall Hummer
Get 1st in all division's of career mode
Get Humvee
Get 1st in the first 3 seasons of career mode
Get Dodge Durango
In the speed division finish 1st in the 4th season
Special vehicles
To unlock special vehicles you have to beat different seasons of the career mode. There are five seasons. You will unlock an Army Humvee, Rod Halls red Humvee, A Shelby Durango, And a 6x6 Dodge pickup
