Brand rankings

The way I look at it they all buy a chassis from Ford ,Chevy, Freightliner etc, put the same appliances in Norcld/Domectic refers Attwood WHs etc. So to me the main discriminator is the house section,and systems integration. It is very difficult to find what MFG processes that the various brands use that would make one better than another. For example what adhesives does Winnebago use to bond their side walls vs Fleetwood? Are the sidewalls cured in an autoclave vs vacuum bonded? Would this process be better against water intrusion and delamination? You can go to their web sites and see marketing terms rather than eng specs and processes. We can all read on here about problems with Norcolds or Domectics and other systems. I think it will come down to reputation over time rather that eng hard facts. There are a lot more Fleetwoods, Winabagos, and Thors than there are CC and Newell's so statistically there would be more problems. frm what I read on here is that Tiffin stands behind their product better than others but the problems seem to be the same.