Owners manuals are not really helpful. They are more or less some very basic information with very little specific about your model. Then they stuff all the manuals for all your components in the same case and that is what you get.
If you have one for similar age models you will likely be in good shape.
Then search separately for the fridge, water heater, thermostat,etc. Those manuals will be more helpful.
If you have specific questions try googling and if no luck post here. Great and helpful members are here frequently. But please search the site first before posting.
Enjoy the trailer!
2018 Voltage 3305