Some more penny thoughts.
I suspect most of the other problems with rear mounted bike racks has been reduced tongue weight and the handling problems associated with that. If your trailer's GAWR can handle it, you can add extra weight, like that battery, on the tongue to compensate some. And maybe split the bikes, only a couple hanging off the rear and the others on the tongue? Anything to keep the trailer balanced with about 12-15% of the weight on the tongue.
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