Overdrive,
Keystone has not produced a model specific owner's manual for any of their products (to my knowledge) All they have is the "generic" manual that you probably have already. Every one of your appliances, your axles, the slide mechanism and even the water pump, propane regulator, toilet, etc should have owner's manuals that were included in the owner's packet. If you are missing them, contact your dealer or get the model numbers for each of these items and search online for a manual.
I'm not aware of anything available from Keystone other than the owner's manual that is available at the Keystone RV website in the customer service section. If you want to look at it to see if it's any more detailed than what you were provided, here's the link:
http://www.keystonerv.com/customer-s.../owners-manual
You may want to look in your package and see if you have the Keystone "build sheet" which is a two page document listing every item in your RV that is tracked individually. This includes all the appliances, tires, axles, etc. Each is listed on this document by model and serial number. It's a very valuable source document to keep in a safe place.
If you have any specific quesitons regarding operation or maintenance of your RV that you can't find answers to either in the manual or using the search feature here, then feel free to ask for help. There's a "bizillion" years of Keystone RV experience lurking around "these parts"