Enter "ZAKARY X" as a name to unlock all trucks and cheat options.

Faster vehicles (alternate) -
Note: This procedure involves editing a game file; create a backup copy of the 
file before proceeding. Enter the "vehicles" sub-directory inside the game 
directory. Use a utility such as WinZip or PKUnzip to extract the "physics.txt" 
file from any of the .zip files. Use a text editor to edit the "physics.txt" 
file and change the "//idealMaxSpeed" entry to "200". Save the file and add it 
back to the original .zip file. The top speed bar will be full for the vehicle 
when the game is played.