Master Cheat
For the master code enter CHEATINGMUTHATRUCKER at the cheat menu

Master code:
Enter CHEATINGMUTHATRUCKER or ATJCEHJMJ as a code in the options
screen. All cheats and the Evil Truck will be unlocked. If you
choose to have the automatic Sat Nav, it will always take you to
where you will get the best price, but you will not be able to race
against the other truckers.

Evil truck:
Enter VARLEY as a code in the options screen.
Alternately, play Trial By Trukin' 60 day mode, then win the race
back to Big Mutha Trucking HQ.

Fast truck:
Enter GINGERBEER as a code in the options screen.

$10 million:
Enter LOTSAMONEY as a code in the options screen.

Level select:
Enter LAZYPLAYER as a code in the options screen.

Bonus levels:
Enter JINGLEBELLS as a code in the options screen.

Unlimited time:
Enter PUBLICTRANSPORT as a code in the options screen.

Disable damage:
Enter 6WL as a code in the options screen.

Automatic Sat Nav:
Enter USETHEFORCE as a code in the options screen.

Diplomatic immunity:
Enter VICTORS as a code in the options screen.

Small pedestrians:
Enter DAISHI as a code in the options screen.

Hint: Easy money:
To get even more money after enabling the "$10 million" code,
whenever you go to the bars (especially in Greenback) play the slot
machines on the left. They will always pay off.

When you go to the garage to trade trailers, buy a trailer extension
so you can haul more product and make more money.

Hint: Save money:
If you have not used a cheat and are still taking damage on your
travels use this trick to save money. When you get to your
destination, sell your goods but do not buy any more until after you
have been to the garage. When you enter the garage, exchange
trailers and the new trailer will have no damage. If you want to get
your old trailer back again, just change again and the damage will
be gone. Note: If you have only sustained minor damage it will
probably be a better value just to repair it.