Sounds like you installed the hitch and never took it out. I would suspect it's simply rusted in place. I would soak it down with a good penetrating oil for a day or two and use a good hammer and drive it out. If it's not rusted then I'm at a loss as to what it could be.
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"What happens at camp stays at camp"
2018 3121RL
2016 Ford F350 SB SRW
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