Alter Settings:
 In gameplay when you are in a truck: 
 Press q, i , f12 at the same time, then press 
 the ~ key. This will bring up a console in the 
 lower left of the screen with a heading like this: 
 4x4> Press enter after each command is put in; the 
 commands are as follows: 
 
 Code Result
 settyrescale(number) - this will determine tire size. 
  (i.e., 4x4>settyrescale(0.5) will 
  give you tiny tires.) 
 hanyman() - will repair your truck 
 ironman(1) - no damage to truck 
 freeman() - will unlock all modes