Hmm. Bugger that they are out of business.
Try inserting a slighty smaller box section inside the draw bar (main beam from the hitch) which will straighten it out and then weld it in place. If you can get the inner box sectioned galvanised as well that will help.
However - make sure your repair the damage to the galvanising after you have welded it in place.
Plus I'm make an effort to float your boat on and off the trailer from now on rather than pushing of/driving on /winching on.