Faced the same problem a few weeks ago. You need a propane torch and an ice pack. Put the ice pack around the male portion and heat the female portion with a propane torch. Then, using a big screwdriver hit the female portion in a direction to unseat it repeatedly. It takes two people. The first 1/32 of an inch took many blows, the next 1/8" less and finally I was able to twist it apart.
If you have ready access to it, dry ice would be preferable to the ice pack but the ice pack worked for me.
The Moose Rack
2-3 Canoe/Kayak Trailer
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