18 Wheeler: American Pro Trucker Cheats - GameCube

Bonus parking levels
Successfully complete each of the four parking levels to unlock an additional parking level. Successfully complete the bonus parking level to unlock a sixth parking level.

Nippon Maru
Successfully complete arcade mode with all four characters.

Lizard Tail
Successfully complete the game with all five trucks (Asphalt Cowboy, Stream Line, Long Horn, Highway Cat, and Nippon Maru).

Bonus trailers
Successfully complete arcade mode with all four characters to unlock two bonus trailers in score attack mode, versus mode, and arcade mode (if the Nippon Maru is selected).

More time
Go into the options menu, select "Difficulty" and set it to "Very Easy". Next, save the game in the options menu and return to the main menu. Select arcade mode and you will have more time in each level, until you reach into the last level and complete the game.

Bonus parts
Go to arcade mode and select any truck. Get to your destination ahead of your rival , then complete the bonus parking mini-game to win bonus parts. Note: This works on any destination.

Shifting
For Highway Cat and Stream Line, shift up when at about 50 mph.

Slip stream
When you are behind a truck, your size you will get a slip stream. This will allow you to get a small boost to get in front of the truck.