Many of us purchase a used trailer and they may not come with all of the details/manuals that come with the appliances and accessories; I was fortunate and my trailer came with a fairly complete build book.
I also have a 6'x10' enclosed Cargo Trailer conversion that I purchased and am still converting for those short trips, and have made copies and/or obtained copies for all of the details/manuals that came with the appliances and accessories and have stored these manuals/details in a binder to keep them together and placed in the trailer. The build book really takes little space and is invaluable. I have also added the manuals and data sheets for added/replaced items in the FunFinder, like the radio, TV's and wall brackets, etc.
Just a thought ... for those that do not have all the appliance and accessory manuals/details, take a little time to get the manufacturer, model and serial numbers from yours ... spend a little time on line and print out the manuals/details for yours, add the serial numbers and even a maintenance chart, place in a binder, and store it in your trailer.
I hope this helps a little ...