i couldnt get my towball hitch out recently when i was out 4wding(i wanted to do a recovery but we had to work out other methods out. anyway, turns out the pic was rusted as fck and the hitch had swollen with rust and just wouldnt budge. it took me a week of soaking wd40 followed by attaching the towbar to a VERY short chain which was wrapped around a telegraph pole and little bit by little bit gently nudging it out. needless to say i replaced the culprit and cleaned out all the left over rust!!!