Welcome to the forum. I have a 2010. Trilliumrv was/is Tom Young. He has a web site with some useful information. Mine was made in southern California by Mattman Specialty Vehicles as part of a joint venture that lasted through 2011. When that went bust I believe Tom Young moved to Arizona where the 2014's were made. I think they were
sold through dealerships at that point. In 2015 the molds were
sold to Great West, who renamed the trailer Trillium Sidekick or just Sidekick. They went bust not long after. Currently there is a company in Canada trying to resurrect the brand.
The manual really isn't all that useful. You are far better off finding the appliance manuals which should be on line. You also can search this forum or post a question. Lots of folks happy to help.
I would recommend you check the bolts that anchor the body to the frame. Mine has 6 bolts as I recall. Next check the date code on the
tires. If they are original, l would replace them. If you don't know when the bearings or
brakes were serviced, that's worth doing. To sterilize the water system add a 1/2 cup bleach and fill. Run the pump to get the pipes. Let it sit over night, drain, and rinse. I lubricate the hinges and the
windows yearly. Add antifreeze in the winter if you live where it gets below freezing. It's a pretty simple trailer. Enjoy, Raz