I can't answer directly if you will be OK, its not the connections I would worry about, 1500 lbs is nothing for the pins.
But you know how leverage works, with the extension and the length of the double receiver thingy, the stress on the system will be pretty high, you might get bending which can lead to failure.
There is nowwhere else to hang those bikes? Sometime I see trailers/campers with a receiver on the back and bikes hanging there. Would that work for your set up?
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