Can 18 Wheels of Steel Haulin run on Windows 7

Yes, it will. Go to the executable file (What you click to start the program), right click it, and select 'Properties'. A menu should pop up. In this menu, click on the 'Compatibility' tab, and select "Run this program in compatibility mode for:" and change it to Windows XP SP3. Save these settings, and assuming your computer has the adequate hardware to run the game, it should work fine!
Cheers!
Joe