Nope, not a good assumption. Three travel trailers in a row and only very minor follow-up warranty work.. very minor on all 3 of them, #4 if you include our original Pop-up. Now, get the behemoth Mastodon 5er that we now own from a well beloved RV dealership and from a manufacturer that we trusted, and in the first year of ownership, more things broke, fell apart, or needed fixing than all my other campers combined. And the warranty work was more serious, like brake failures and improperly install entrance doors, and underbelly falling off.
No, there is no rhyme or logic to the assumption. They are all just lousy made these day. The good thing is, the 5er has had some pretty stout fixes done to it. It's pretty stable now! Most I did myself.