In Artic waste Land, if you can find it, there is a fenced in area, and behind the house there is a chest of alot cash . You know you have teh right place if you see an American flag and a truck looking thing with tracks.
Unlock all Missions:
While at the "Press Start" screen, press Z, Z, White, White, Y, Y, White, X, Y, Y, X, White.
While at the "Press Start" screen, press Y, Y, White, X, X, White, Y, Y, Y, X, X, X.
Unlock Extra Money:
While at the "Press Start" screen, press Y, X, White, Y, X, White, X, X, Y, White, X, Y.
Farm Road 109 Shortcut :
When trying to use the shortcut across the railroad tracks, use the Jeep Liberty Sport.
It can almost always get across before the train crosses if you approach from the right side of the tracks.
Extra cash :
First load your career then push YX WHITE YX WHITE XXY WHITE XY.
This cheat takes a while but it's worth it. Once you have a truck successfully complete a mission, any mission is fine but the more money you earn on the mission the faster you'll gain money. After you have completed the mission. Save the game as you regularly would, then go to garage, profiles, save game, press B, then choose no to save game. This will put you back on the end of mission screen. After this don't save and keep doing it again, it'll work over and over.
At the start enter xx,(w), yy yxyx and a cheat option will appear.