A fixed post? That's not too good
Could you cut it off and u-bolt an adjustable one on there?
It actually sounds as though you could do with another trailer- the more support you can get for the transom the better, and with 2 feet overhanging the forces have to be a bit much on the rearmost point of support.
<edit. Just a thought but hypalon is probably abrasion resistant enough to bostik a couple of pieces to the transom/running surface join to stop the ratchets rubbing the gelcoat. It'd be cheaper than a new trailer or tubes and if you didn't key the gelcoat first it'd peel off easily if you wanted to remove it.
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