18 Wheeler - American Pro Trucker cheats and cheat codes for Dreamcast

Disable timer and unlock all cars, trucks:
Go the main menu, and enter the following button combination:
Hold L and press A, Y, X, B, Left, Start

Additional parking levels
Finish all 4 parking levels

Unlock 6th parking level:
Finish the bonus 5 parking level

Unlock Nipon maru:
Finish arcade mode with all 4 characters

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.