The manual for the trailer probably won' help you much. Almost all of the components have their own manual, so there's nothing left except the frame and coupler to be in the trailer Owner's Guide.
Axles, AC, furnace, range, oven, water heater, TV antenna, refrigerator, microwave, sterio, water pump, awning, tires, stabilizers, power distribution (fuse) box, power unit for any slide(s), you name it and there is a separate manual for it. If you have problems with a component, get the model number of the component and the name of the manufacturer of the component, then find them on the internet. And you'll probably find the Owner's Guide for that component.
Grumpy ole man with over 50 years towing experience. Now my heaviest trailer is a 7,000-pound enclosed cargo trailer, RV is a 5,600 pound Skyline Nomad Joey 196S, and my tow vehicle is a 2012 F-150 EcoBoost SuperCrew.