I see no responses to your posting as yet. My first reaction.....good luck getting anything done on your coach from Thor now.....but maybe the Grinch will have mercy on you. It looks like this socket and pin connection has been open for a while considering the rust formation. Assuming Thor ignores you, I wonder if you can clean up the rust situation a little and then try to gently move and re-seat the support beam back onto the chassis pin portion with some careful prying or small jack?
Is the matching connection on the other side of the coach welded or fastened in some way? If yes you may need to get some welding done once reseated.....precautions with that process and your coach electrical systems.
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