Gitrdun,
If you are interested in a medium duty truck, there is a LOT of information on the Escapees website here...
http://escapees.infopop.cc/eve/ubb.x
Go there and scroll about half way down to MDT.
Just under there you will find the threads for folks who have HDT's or heavy duty trucks. It will take you several weeks of reading to catch up but it is worth the effort if you are really thinking about moving up to an MDT.