In time trial mode, enter these driver names:
 
 RAINFROG  = Switch the weather to daytime severe and
             it will rain frogs!
 DUTCHMAN  = Go to the credit screen and get ready to
             play ROIDS!
 MAINLINE  = Gets you the truck called 'Mother'
 
             
 All Trucks:
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 At the main menu type in hctrucks