I'm looking to widen a boat trailer by u-bolting a welded rectangular frame outside of the existing one as shown in the attached figure. The springs would then be relocated from the inner frame to the outer frame. The existing frame is 1200mm wide and the new frame would be around 1700mm and made from 50x50x3 RHS. Would there be any structural or other issues with this approach, or suggested improvements? Any feedback would be greatly appreciated.

Cheers
Blair
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