This has been discussed frequently and has often been stated that some manufacturers will void the warranty if one is used. It certainly does introduce a different set of stresses on the frame members. By adding a lever (the gooseneck extension) you are putting additional rotational forces (torque) to those members.
Now having said that, there are many who do use them, seemingly with no problem.
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Bill & Patricia
Riley, our Golden
2007 3075RL (recently sold, currently without)
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