Type in in pause mode: 

Cheat code:             Effect:
slallcheats             Cheat mode activated
sllottery               +50000 EUR and 1 Licence
slroads                 All roads open
slrepair                Press [Backspace] for a free repair
slrecover               Press [Ctrl][5] for a free recovery
slfillup                Unlimited fuel
minesoff                No mines
slmap                   All hidden containers visible on the map 
619blue                 Change truck with Blue Bus
619red                  Change truck with Red Bus
619white                Change truck with White Bus
619brown                Change truck with Brown Bus

     Shut  down  engine  of  the truck (I test on Kenworth) and at the
same time press Ctrl-up-(1,2,3 or 4) if you press:

1. Truck will go forward
2. Truck will go backward
3. Truck will go up
4. Unknown

slturbine   - Activates the key combinations: 

[Ctrl][1]               More forward thrust
[Ctrl][2]               More backward thrust
[Ctrl][3]               More thrust upturn
[Ctrl][4]               More thrust downturn

     Type "DXSHOWINGYOU" (without "")in PAUSE MODE; Now,when you go to
the  list  of  your  hired Drivers to change the your truck with their
truck,  you'll  be provided the location of your hired DRIVER whom you
want to change your truck.