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@DFP
To pull a really heavy load I think the designs that clamp to both sides of the bike are better. Especially if you are clamping to a skinny road bike.
You can make a seperate section to go in between the actual trailer and the stays. A bit like this:
So you still get the hinge/pivot. Because the stresses will be symettrically balanced, you wont have to overbuild/reinforce the connecting arm as much. There will also be less concern at the connection point to bike, which may fail pulling something really big or with braking.