Hymer North America started as Roadtrek, the Class B motorhome manufacturer, and added a version of Hymer's European travel trailer, plus some smaller operations with Jeep accessories. The Class B owners will still have chassis warranties, and all RV owners will have component warranties from the component manufacturers. For coverage of the work done by Hymer NA, my guess is that they're out of luck.
I suspected that this was going to be the result when the Hymer North America websites didn't even acknowledge the Thor acquisition of Erwin Hymer Group without Hymer NA, and the resulting orphaning of Hymer NA; they didn't reorganize, they quit. Those sites are now down.
It's unfortunate that mismanagement (and allegedly outright fraud) appears to have killed Roadtrek, but someone might buy the name and some tooling out of bankruptcy and revive the Class B operation (with Roadtrek models only, not Hymer). My guess is that the travel trailer venture is dead, unless someone wants to buy the moulds and make a trailer with a new brand name.