Book suggestion for tractor and trailer systems informaiton for drivers?

I have been looking for a book for newbie tractor-trailer drivers. I am particularly interested in mechanical/systems information. I don't need a shop manual (though I did look for a used one but a mechanic told me that, when they went all digital, the company made them throw their books out; they couldn't keep them!) but just some basic information about the common systems and trouble-shooting guides, etc.
I am a good back-yard mechanic with gas vehicles (I have engine rebuilding experience, etc.) and can diagnosis stuff pretty well with those but I don't know much about desiels and air & wet systems.
Any suggestions/information appreciated.
Thank you.