If your budget is 20k, you are probably better off looking at spending 18k for the trailer. That will leave you a nice cushion to buy all the stuff that doesn’t come with one. A privately owned, used one might come with more “stuff”.
For what I’ve seen, until you get into the higher cost TT’s, they are pretty much all alike. And they all, regardless of cost, require maintenance. When we bought ours, I really didn’t care who made it. It was exactly what we wanted and still is.
Obviously the whole thing is worth it to a bunch of owners.