Originally Posted by ThomasBalmer
Not sure what the complaint here is. It sounds like you are asking for one brand to have one rating. I cannot imagine that would be helpful, something akin to a Corvette getting the same rating as a a Silverado pickup, just because they are both made by Chevrolet.
The parallel doesn't quite hold, as many trailer models are typically made in the same manufacturing facility using the same materials and processes. In automotive terms it's more like comparing a regular cab 2WD and a crew cab 4WD Silverado made in the same plant.
On the other hand, RV manufacturers often offer several lines of trailers ranging from economy to deluxe and using different materials, so it would make sense to rate each line separately. Chevy vs. Buick, since you like automotive parallels.
One of the big difficulties with guidebooks to RV quality is the pervasive practice of discontinuing a line that gets a bad reputation, and then rolling out a "brand new" line with a different name and look, but made in the same old plant using similar materials and the same manufacturing process. That's why it does make some sense to look at the overall track record of the parent company and not pay too much attention to names and models.
"There is nothing new under the sun"... or perhaps very little, when it comes to RV's!