Normally they are held together with 4 to 6 exposed bolts. You take these out and lower or raise the pin 1 bolt hole set. On that age trailer it will probably be rusted and hard to get loose.
It would be easier to raise or lower the 5er hitch . These can usually be raised or lowered several inches much easier than the pin box.
Ken
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Amateur Radio Operator (KE5DFR)|No Longer Full-Time! - 2023 Cougar 22MLS toted by 2022 F150, 3.5L EcoBoost Tow Max FX4 Lariat Travel with one Standard Schnauzer and one small Timneh African Gray Parrot, retired mechanical engineer
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