Open the file where your last game was saved
[C:\Documents and Settings\Admin\My Documents\18 WoS American Long Haul\save]
open the folder 1 and open the first file using a word editor find trucks and enter 
8 instead of 1 then enter these text save it and open the games which you had saved at 
first now enjoy

the code:
---------
trucks[1]: _nameless.0EEA.5890
trucks[2]: _nameless.2051.2E20
trucks[3]: _nameless.2058.0ED0
trucks[4]: _nameless.0EEA.EA08
trucks[5]: _nameless.21C2.C0D8
trucks[6]: _nameless.2059.2E00
trucks[7]: _nameless.2058.1050