You don't need the "main" book.
The trailer manufactures books are rather generic in nature, tend to cover multiple models of trailers and offer no real usable info you really can use.
If you are looking for specific things like low drain points, tank sizes and placement and or electrical schematics you may as well forget about that, those items typically are never included with any manuals..
The manuals that you really want to have is the appliance ones, those are just thrown in the manual package and are loose from the "main" manual.
Pretty much many appliance manuals can be found online in PDF form, just google the brand name and model number and you should be able to locate all the appliance manuals.
