Unlock the following trucks by performing the corresponding tasks:
TRUCK - HOW TO UNLOCK Backwards Bob - Reach level 7. Black Stallion - Reach level 6. Blacksmith - Reach level 15. Blue Thunder - Finish first in Houston Stadium Race. Bounty Hunter - Finish first in Southern Series. Brutus - Reach level 5. Bulldozer - Reach level 4. Captain's Curse - Finish first in Oakland Gate Rush. Destroyer - Reach level 12. El Toro Loco - Finish first in San Diego Time Crush. Grave Digger - Finish first in Orlando Freestyle. Grinder - Finish first in Minneapolis Circuit Race. Gunslinger - Reach level 9. Jurassic Attack - Reach level 10. King Krunch - Reach level 13. Madusa - Reach level 3. Maximum Destruction - Finish first in Indianapolis Stadium Race. Monster Mutt - Finish first in New Orleans Circuit Race. Mowhawk Warrior - Finish first in Las Vegas Freestyle. Predator - Finish first in Western Series. Stone Crusher - Reach level 8. War Wizard - Reach level 2.