What Roamer said ^^^
I also bought a new travel trailer and will not worry about depreciation. I have only had issues with components, not the trailer. Unfortunately, because of the few manufacturers and virtual monopolies, the components are the weak link. I am not handy/strong enough to fix stuff, so new and under warranty is the way I went. I spent more than I wanted to, but I got a trailer that makes me happy. I've been full-timing in it for a year and so far have had no complaints with the quality.
Yes, there are plenty of people who say I'm foolish, but I always have bought new cars and whatnot. But as a single woman, I've never been stuck by the side of the road with 4 kids in 110F temps. That means a lot to me. Money has never been plentiful, but my priorities are important enough that I waste it to make myself happy.
Ted