18 Wheeler: American Pro Trucker Cheats
Enter code in the title screen
Code: Press and hold X and push Start. Keep X held until the mode selection screen appears.
Hit a bonus head first, then enter code
Code: press L1 + R1 + X
After finishing arcade mode with all four characters
Bonus parking levels
Finish the bonus parking level
Go to arcade mode and select any truck. Get to your destination ahead of your rival , then complete the bonus parking mini-game
After finishing the game with all five trucks (Asphalt Cowboy, Stream Line, Long Horn, Highway Cat, and Nippon Maru).
When you are behind a truck, your size you will get a slip stream
For Highway Cat and Stream Line, shift up when at about 50 mph.