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Brommers-
it only has @Cycliste on the back
It's your weight in the middle which is going to make it flex. Given that Mercian know what they are doing, I expect they've worked out that they can make a more comfortable tandem which still handles well by using that flattened drain pipe.
gbj_tester
Laterally stiff, vertically compliant 🙂
With all three tubes in the stoker's compartment nearly parallel, I bet that does actually flex up and down quite a bit.