Towing Issues: hook up book for tractor and trailers, light duty trucks, tow points

Question
We all have access to a number of manuals regarding tow points and do's and don'ts regarding cars and light duty trucks.  Is there a manual or a "user friendly" computer program that has general or specific information in regards to tractor and trailers.

Answer
as much as I would love to say YES, but there is very little information about towing tractor trailers, motor homes, buses and such.

Now there are a few places online where you can find information about towing vehicles..

check out www.towspec.com
  
         www.tow411.net