There are at least three separate types of quality in RV manufacturing:
Quality of Assembly: What we usually talk about. For example, poor quality of assembly would be not using the clutch release mechanism on battery operated screw guns properly and stripping out all the self tapping screws or having leaks in the plumbing.
Quality of Materials: For example, poor quality of materials would be using Luan instead of composite material or OSB instead of plywood or in the case of a rubber roof using an EPDM roof instead of TPO.
Quality of Design: For example, poor quality of design would be unacceptably low wheelbase/length ratios or inability to open the refrigerator or access a bathroom with the slide-out in or a very low cargo capacity.
My experience has been when I found a manufacturer that did one type of quality right, they screwed up the others.