Tell that to the Tubus duo and Salsa down under
Both of which are triangulated Blackburn-style of both sides of the fork blade? The Fern racks are attached on one side of the seatstay by a long-ish bolt, which is going to see a bending load if anything bumps the luggage from the side.
I suppose that theres a horizontal connection between the two seatstay mountings through the spokes which you cant see thanks to the photo angle
@Thrustvector started
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Tell that to the Tubus duo and Salsa down under