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Playstation 2 - 18 Wheeler - American Pro Trucker cheats

Unlock extra parking levels
Finish all 4 parking stages

Unlock 6th parking stage
Complete the bonus 5 parking stage

Unlock Nippon Maru
Jump to the title screen hold X, after push Start. Keep holding X until, 
you will see the Mode Selection screen.  Choose a game mode, to unlock 
Nippon Maru.

Unlock Lizard Tail 
Finish the game with all 5 trucks, including the extra car: Nippon Maru. 

Unlock in trailers in Score Attack, Versus and Arcade mode for all trucks:
Finish the arcade mode with all 4 characters. 

Get bonus parts 
Complete the parking mini-ame, afterwards defeat your opponent in 
any Arcade race.