Straight or 2" drop most common. Small trailers(no trailer brakes) use 1 7/8 ball, medium trailers(with trailer brakes) use 2" ball, badass trailers(with bigger trailer brakes) use 2 5/16" ball. Start off with the straight insert with a 1 7/8" ball and go from there. ball size is stamped on the trailer coupler.
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