Cost can bring other attributes other than quality. It can bring design or costly materials. It can bring expensive assembly methods. It can bring nothing. Over time there have been products where cost did bring well regarded quality. One example I can think of was Sony TVs in the 1970s and early 1980s.
I think RVs are a product where the quality is often reduced due to the very price competitive nature of this discretionary product. A little more cost could equal a much better build. But then as prices rise, it is more bells and whistles, more design, more expensive materials. Quality doesn't get the lift that is hoped for.
I will give a shout out to the Lazy Daze. It isn't flashy but it has been solid for the last couple years.