If my memory serves me right using a Goose Neck Adapter on the pin box, per Lippert, will void the warranty. I have see at least two Heartland 5ers that had a broken frame due to Goose Neck Adapters..
I use the B&W Turnover Ball with Companion 5th wheel to keep my deck clean.
FWIW...
BC
We have pulled 5ers for almost 40 years. About since they started making them. Since we farm and ranch we have always used Goose Neck Adapters. We had one on our Wilderness, Excel, Travel Villa, Coachman, Yellowstone and so on. Never a problem and didn't even think about being an issue. We were told the same thing regarding the Lippert warranty. We plan on using the adapter as well. Surely the frames are built as well now as they were years ago. If not then they should be. Just my opinion.
The BW combination makes sense but a lot of our pickups have flat beds with recessed balls. They are all 30K balls but cant be accessed with the companion. That leave us in the majority of other farm/ranch folks out there that like to RV a bit. Kind of irritation to say the least.