first call scamp. they are great people and will give you all the help they can. then i think your bolts to attach get undone, and it basicly lifts off, not counting all the tubes and plumbing and wiring yopu hae to watch for.
now,,how are you going to lift it?well,,,,you not. your going to lower the frame out from under it.
get some car ramps and pull the trailer up on them, this will give you room to work under it. then when all fasteners are removed, you use a jack to raise the body slightly and place blocks under it to support it above the frame. this will require building up piers outside of the frame running truses acrossed and placing load blocks on the truses. the truses can probably be 2x8 on edge with a block of 2x4 on top or even 2x6 to spread the load.
you then remove the tires
from the axel lower it down and slide it out.