This forum has great ideas, help, and whatever you need! I am impressed you are tackling such a big job in 2 months! Good luck! We have a tiny trailer compared to you.... but my hubby has a good thread with lots of pictures. Many items might be the same for you, so you might want to review it. It is long....get a cup of coffee and go to it!
I would recommend looking under the belly pan before you remove the flooring. If the flooring is solid... you might get away without taking the shell off...depends on what you want to do.
Anyway, good luck on your project and here is the thread I mentioned:
Mrs. NorCal Bambi (traveling in S Tardis)