IMO, buying a trailer is much like people with their vehicles.
Some folks buy it, never wax it, never "make it better" and only reactively fix an item - when it does breaks. Like a BIC lighter, they use it until it costs too much to fix, then get rid of it (re: throw it away, sell or trade it in for another). Especially since Trailer ownership is between 3-5 years.
Others buy a vehicle, add little things to it (to make it better than factory) and in the end, dramatically reduce the risk of things reactively breaking. Especially while on the road - far away from home.
For me, I investigate each of my trailers and where needed, +1 its tires, +1 its leaf spring packs, replace factory linear brake wiring with much better STAR brake wiring AFTER its factory warranty is over. I will also install better power fan in the bathroom, install roof vents, install better mattress, LED tail light upgrades, electrical Surge protection, etc. etc. Make it better for longer life and to reduce the risk of "reactive" breakage. And, upgrade the things that make its usage better for me (to my liking) as well.
Remember that RV factories only build to "minimum" SPECs. Above minimum means more profits out of their pocket (which is a bad thing from their view). If you want "better than factory" and plan to keep your trailer a long time, then some "minimum spec" items must be upgraded yourself. Sad to say but true....