If you are weak and or have limited mobility (I am both), it might help to have an extra hand or something to rest once side of the trailer b**** on or you will have a hard time getting the bolt through. I was on my back, arched stomach up and using my knee to hold the other side up while trying to thread the bolt lol.
Well, I've been working on my own motorcycles for about 18 years, so I've got a good collection of floor jacks, jack stands, atv pneumatic lifts, etc. I should be able to rig something up to hold one side at a time. Thanks for the heads up.