put landing gear all the way down, blocked up the back. lifted gear back up. lifted the front with the tractor, and pulled the trailer out by hand.
if you don't have something to lift the fron end with others have used a jack to lift the front and slowly work the trailer out, by lifting, moving, setting down, and repeating.
I would suggest maybe parking a pick up beside it and using a long 4x4 10-12' have a couple of people lift it and someone pull the trailer and then block it.