I seriously doubt the spot is still marked on your trailer because of it's age, but they come from the factory with a spot marked on the frame behind the axles of where to place the jack.
But that aside, there is a plate where the axles are bolted to the frame, and the trailer can be safely jacked under that plate.
I use the jack from my truck, or drive one wheel up on a block to lift the other, but that won't work on your 20' because I believe it is a single axle. I must use a 4X4 block with the truck jack.
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