Various Cheats:

Go to the options cheat screen and enter a code below

CHEATINGMUTHATRUCKER - Unlock everything!

GINGERBEER - Fast truck

VICTORS - get diplomatic immunity

PUBLICTRANSPORT - Get unlimited time

DAISHI - Tiny pedestrians

6WL - Damage toggle

VARLEY - Get evil truck

LAZYPLAYER - Level Select

LOTSAMONEY - get $$

USETHEFORCE - Auto sat nav

New Rig:
Win the Race to Big Mutha Truckin in the 60 day version of Trial by Truckin to unlock the new rig

Extra Cash:
Ever wonder what maximum fruit does? The slot machines that you see at the bars are rigged! Every time you use them, you can't lose! You get BAR on every space! ( Greenback Jackpot recommended)