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If you don't mind cutting it back up, a relatively self-centering pivot point on the top hinge point can be made with 2 sizes of tubing and a bit of cutting/grinding. It would allow you to drop the carrier into the hitch upright and then insert the pin easily.
Basically, you want to install a piece of tubing through the upright on the carrier that sticks out about 1/2-3/4" each side. Slot the inner sides of the hitch uprights for those tubing stubs to drop into. Weld a slightly larger tube size into the hitch uprights for the carrier upright stubs to rest on. Then weld in the same size tubing as used in the carrier upright to the hitch uprights - basically you are making a captured door hinge.
If you make the slots angled rearwards, so the weight of the carrier pulls it into alignment at the bottom of the slot, you are pretty much guaranteed that the hole for the pin will line up automatically.
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