Hymer North America went bankrupt due various finial "irregularities". I believe what was left was bought by Thor. Left a lot of people out in the cold on warranties from my understanding.
Thor planned to acquire Hymer Europe and NA, but discovered the fraud during due diligence and elected not to acquire the NA business (a lot of which was Roadtrek). Thor/Hymer Europe has formed a new US entity for new products. Most of the high-volume brands are a notch down from there.
I agree about Advanced. A notch down would be Safari Condo’s XL Flex and Leisure Travel Vans.
(Many in the US have never heard of Hymer even though they’re huge in Europe: https://en.wikipedia.org/wiki/Hymer. They’re now owned by Thor, which owns Airstream, Jayco, and many other RV companies: https://www.thorindustries.com/brands)