Goose Neck Hitches, Good or Bad

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I have a friend who bought a 2008 Dodge used with a Goose Neck hitch. I told him most people don't use them and if used on a new 5th wheel can void your warranty. What are the advantages or disadvantages of one. He likes the idea of a smooth bed in his truck.I figured this is a good place for ideas on this subject with all the experience of the members.