Looking at different RV brands, I’ve seen a lot of them with parts with the Lippert name on them. I know that they provide a lot of the chasses that 5th wheels are made on, but I saw their name on windows when I was looking at a Grand Design.
Lippert is one of the two or three manufacturers that makes pretty much everything in or on an RV.
They own Thomas Payne (furniture), Furrion (most of the interior electronics), and probably a bunch more that I can't remember at this point.
They aren't a Grand Design company, but GD doesn't have too many choices when it comes to RV parts, and Lippert is probably the largest player in the market.