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Just imagine grabbing the pin on your pin box and pulling the trailer forward with a straight force. Now imagine adding a 3 foot extension to the pin and grabbing the lower end of the extension and pulling forward in a straight line. In the later scenario you would be adding a twisting force to the pin box and frame.
I think horse trailers and the like are designed for that torque force. I don't think a 5th wheel frame and pin box are designed for that twisting torque. Does that mean failure? Maybe, maybe not?
Obviously some 5th wheel owners have had good luck with the goose neck set up. Does that mean everyone will? Personally I wouldn't gamble on the possibility of twisting the frame my pin box is attached too. Good luck with it.
P.S. if I were set against a 5th wheel hitch I'd go with the Anderson hitch. It is easy to remove,(light) and it is pulling from the same level point as the 5th wheel hitch.
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