It would be sheer luck to find an owners manual for something like that, and likely a huge disappointment. Most owners manuals are extremely generic - very little or no information specific to your trailer (like the location of fuses for instance).
To learn more about using and servicing any on-board appliances, do a google search on the make and model number. Generally about anything available will come up easily.
Congrats on you purchase, and best of luck with it!
1997 37' HR Endeavor, 275hp Cat, Freightliner
03 CR-V Blue Ox, Ready Brake