Learn to swing your trailer and hit cars. If you done correctly, you can swing into the cars so fast that you will barely lose speed, if any at all, and still get the accident points.
Various Codes
At the Main menu, highlight the (trial by trucking) option and press the Y button and the cheat menu will appear.
BIKERS - Adds lots of bikers
BRIDGE - Opens all bridges
CASH - Gives you 115,000
COPS - Adds lots of cops
GALLERY - Unlocks all of the gallery images
MISSIONS - Unlocks all mission within the game
NOCOPS - Removes all of the police
NODAMAGE - Makes you invincible
PJ - Pay off next juror