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Playstation 2 - Monster Jam - Maximum Destruction cheats

Unlock 1983 Grave Digger
Win 1st place in season 1 in cash grab mode in normal difficulty level

Unlock 20th Anniversary Grave Digger
Win 1st place in season 2 in cash grab mode in normal difficulty level

The Incredible Hulk
Win 1st place in season 3 in cash grab mode in normal difficulty level

Unlock Championship truck
Win 1st place a season in cash grab mode in any difficulty level

Unlock IP/Inland truck
Win 1st place in season 1 in cash grab mode in hard difficulty level

Unlock Big Yellow
Win 1st place in season 2 in cash grab mode in hard difficulty level

Unlock Hooch              
Win 1st place in season 3 in any mode on the hard difficulty level

Unlock all Trucks:
Press R1, R1, R2, R2, L1, L1, L2, L2, START

Jumping:
Hold Up, release, then press Down.

Wheelie:
Hold Down, then press X.

Freeze opponents:
Press Up, Down continuously until the man says "It's Monster Jam". 
Not works always.