Adding weight forward of the trailer axle should not impact trailer handling. It is weight behind the axle you have to worry about. With more weight up front, you might have to crank up the WDH an extra notch, but that is about it.
I have no idea how strong the metal tray is - that's a different question. But I'm sure the factory could tell you, and a dealer should be able to tell you. Let us know if you find out.
Bill
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