Originally Posted by
Artkansas
You might check the
Bikes At Work site. They specialize in heavy-duty trailers, and also sell a variety of trailer hitches.
My recommendation
IF you are mechanically inclined and don't mind tinkering you might be able to buy a hitch from somewhere and fabricate your own system. Burley, Chariot and One Step all sell replacement hitches on their websites.
Aaron
Aaron