Trilliumrv made trailers in California for a few years. Then production moved to Arizona and for a brief time they were
sold at dealers. The molds were
sold to Great West Vans and the
Trillium Sidekick was produced starting 2014, I believe. I have a 2010 13'. Build quality was horrible. Numerous problems, the worst was multiple
leaks along the belly band. Trilliums have a plywood floor between two
fiberglass panels. If water gets in there the floor can rot.
I'm guessing a 2013 was made in Arizona. Look for a sticker on the drivers side front. The 15' has a full size bed and a little more space in the front. Unfortunately the front toilet takes up space where a front dinette could go, so you have to use the rear dinette which requires tearing down the bed. Finally the
windows are a Hehr jalousie. Four sides of ventilation that can be open when raining.
I repaired the defects on mine and currently have over 85k miles on the trailer. When I bought mine, they were making the molds for the 15' or I would have bought one for the larger bed. I would have ordered a front dinette model with no shower and no AC. Good luck. Raz