My trailer-hitch-in-progress has two downward pointing ears for the safety chains to pass through. I'd thought about adding a steering damper that would be positioned just under the hitch.
There is a category of 'load-leveling' or 'equalizing' hitches you might want to look into.
I also saw someone suggested running with the trailer tire half-flat. Sort of a real primitive air suspension with no unsprung weight? You could compare aired up with load against empty with low pressure.
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