The following are the Dip Switch settings based off of MAME 0.180 source code.
 
Use this information at your own risk!  The information was parsed from the MAME source code and could contain errors as to the state, order or descriptions of what the switches do.  If you find an error, please let me know on the Contact Us form and I will work on correcting the issue. 
 
 
 
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Manufactured by Midway, Released in 1979
ROM Version: 18 Wheeler (set 1)
Print
Dip Switch:SW
12345678FunctionOption
OnOn      Coinage1 Coin/1 Credit*
OffOn      1 Coin/2 Credits
OnOff      2 Coins/1 Credit
OffOff      2 Coins/3 Credits
When Game Time set to 90 seconds
  OnOff    Extended Time15 seconds at 8000
  OnOn    20 seconds at 10000*
  OnOff    20 seconds at 12000
  OnOff    20 seconds at 15000
  OnOn    20 seconds at 4000*
  OnOn    20 seconds at 6000*
  OnOn    20 seconds at 8000*
  OnOff    20 seconds at 9000
  OffOff    30 seconds at 10000
  OffOff    30 seconds at 12000
  OffOn    30 seconds at 12000
  OffOn    30 seconds at 15000
  OffOff    30 seconds at 16000
  OffOff    30 seconds at 20000
  OffOn    30 seconds at 8000
  OffOn    30 seconds at 9000
    OnOn  Game Time60 seconds*
    OffOn  70 seconds
    OnOff  80 seconds
    OffOff  90 seconds
      Off I/O TestOff*
      On On
ROM Version: 18 Wheeler (set 2)
Print
Dip Switch:SW
12345678FunctionOption
OnOn      Coinage1 Coin/1 Credit*
OffOn      1 Coin/2 Credits
OnOff      2 Coins/1 Credit
OffOff      2 Coins/3 Credits
When Game Time set to 90 seconds
  OnOff    Extended Time15 seconds at 8000
  OnOn    20 seconds at 10000*
  OnOff    20 seconds at 12000
  OnOff    20 seconds at 15000
  OnOn    20 seconds at 4000*
  OnOn    20 seconds at 6000*
  OnOn    20 seconds at 8000*
  OnOff    20 seconds at 9000
  OffOff    30 seconds at 10000
  OffOff    30 seconds at 12000
  OffOn    30 seconds at 12000
  OffOn    30 seconds at 15000
  OffOff    30 seconds at 16000
  OffOff    30 seconds at 20000
  OffOn    30 seconds at 8000
  OffOn    30 seconds at 9000
    OnOn  Game Time60 seconds*
    OffOn  70 seconds
    OnOff  80 seconds
    OffOff  90 seconds
      Off I/O TestOff*
      On On
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