My guess would be that the swing tongue adds about 50 pounds at most - probably less. You can think of the construction as little more than taking a "normal" TM, sawing off the front two feet of the A-frame, welding metal plates across the sawed-off ends (both the ends of the frame rails and the ends of the two-foot piece of A-frame), and adding a couple heavy brackets for the pins. It's a bit more complicated than that, of course, but that's the general idea.
I thought I had been to the TM website and seen the added weight due to the swing tongue, but I can't find it now.
Bill
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