Even though this information has been designated for GM Truck Late Model Fleet Vehicle Buyers and Service personnel… there are some very valuable resource materials available for download on the left margin of this site's "Resources" sub-page that cover things like Towing Capacities and adjustments for safety and equipment endurance and Rare VIN Cards for both early and later model truck line series to decipher your VIN data. If you have been keeping up a “Mechanics Library” in the PDF Format… these additions will be nice to place on your library PDF shelves:
https://www.gmfleet.com/resources.html
ACDelco Web Based Training Catalog PDF:
https://www.acdelco.com/content/dam...g/pdfs/training-brochure-download-desktop.pdf
ACDelco Tech2 Training Guide PDF: (...redundant to what @Mooseman has collected and archived in the TECH2 Sub-Forum... but this is meant to encourage getting one):
http://auto-diagnostics.info/pdf/tech2_users_guide.pdf
https://www.gmfleet.com/resources.html
ACDelco Web Based Training Catalog PDF:
https://www.acdelco.com/content/dam...g/pdfs/training-brochure-download-desktop.pdf
ACDelco Tech2 Training Guide PDF: (...redundant to what @Mooseman has collected and archived in the TECH2 Sub-Forum... but this is meant to encourage getting one):
http://auto-diagnostics.info/pdf/tech2_users_guide.pdf