18 Wheeler American Pro Trucker
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.
Successfully complete arcade mode with all four characters.
Successfully complete the game with all five trucks (Asphalt Cowboy,
Stream Line, Long Horn, Highway Cat, and Nippon Maru).
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).
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.