I had the TrailAir pin box you have on my toyhauler. It was nice, I just wanted to clear my bed and shed some weight of the actual hitch. I would not use a gooseneck "adapter" You can see it is more like the 5th wheel hitch than an adapter. Again, the Goosebox is the only gooseneck conversion approved by Lippert, it will not void your warranty.Pic below is good as it gets IMHO. Front to back absorption and up and down absorption. I would wager the "slop" in the gooseneck connection is no more or less than the Companion that is near nothing. The picture shown will not void the frame warranty as many gooseneck adapters will with the additional stress placed on the pin box frame support.
I have nothing against the gooseneck setups but they are not perfect either.
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