My guess (I have no specific knowledge) is that you shouldn't put the jack under the swing tongue. It is not designed to carry the entire weight of the trailer (or half of it, depending on how you are jacking). However, jacking anywhere behind it should be OK. When I jack up my TM for this purpose, I put the jacks under the frame just ahead of the wheels. You don't have to lift as far with the jacks there.
Bill
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