I removed mine last spring and replaced the last 4 feet of flooring as well. I removed the belly pan all the way to the fresh tank where the sheet ends. I have heard of people that take the back down and then roll it back under the trailer towards the front to get it out of your way. It will roll fairly easily when you get the blind rivets out.
I just decided to make it a bigger project and since I had it out I added grey tanks and re-insulated as well as Por15 all the way to the fresh tank.