The gooseneck adapters have been discussed ad nauseum over the years. Many claiming ultimate failure of the frame if you use one. No doubt the rigid gooseneck adapters put a rotational force on the pin box to which it was not designed. But having said that, I have never read where anyone actually said they had a frame failure due to using one. And many do use them.
But Lippert has endorsed the Goose box as an acceptable hitch. Which makes sense since it is a Lippert product. So that is the way I would go if you choose to use one. The air bag, shock absorbers, and rubber bumpers apparently eliminate the stresses.
Bill & Patricia
2012 F350 SRW CC LB FX4 6.7