The actual trailer manual is slim and pretty generic, e.g. how to wash the exterior, upholstery care, and stuff like that. Little, if anythng, about operation of the RV and its systems. Instead, you get a bunch of separate manuals for the fridge, a/c, water pump, tv, furnace, etc., the manuals provided by the manufacturer of each appliance or component. hose manuals are usually available online, often direct from the appliance manufacturer. Just identify the make and model of each appliance and search online - Google can help you find most of them quickly.
Here is a place that has identified sources for quite a few RV appliance manuals - maybe that will help.
RV Manual sources