Congrats on the new trailer! I doubt there was ever a manual specific to your trailer. Most trailers don't come with an owners manual per se. Instead its typically a collection of the manuals for all of the installed equipment. I bought mine new and it came with the manuals (and warranty cards) for the fridge, oven, heater, power converter, awning, hot water heater, etc. The best bet is to get the model and serial numbers off all of your 'stuff' and download the equipment specific manuals. Most are available off of the manufacturers websites like dometic, suburban or atwood. If you can't find one on the internet, let us know what model you have and someone may be able to send you a scanned copy.
2011 Chevy Silverado Crew Cab 4X4
2009 210 WBS