We've been researching the forums like crazy, but I'm giving up and asking a question for now. My eyes are crossing!
Today, we removed one rear interior panel and found those crazy upside down bent bolts in the c-channel.
From there, I went outside just to look around and try to make sense of it all. Here's what I found under the opening where the water heater (?) used to be.
Then I thought, oh boy, what else does this mean? I walked around to the other side and found this:
We got concerned and stopped. What we are wondering is:
1. Can we go ahead with the floor replacement now, or do we need to fix the rear sag first?
2. Do we need to replace the axles before we attempt the rear sag?
3. Do they affect each other?
4. I suppose this means we HAVE TO remove the belly skin now? We won't be able to bolt the new plywood floor back on properly if we don't, right?
This is feeling scarily complicated.
5. Are we seriously compromising the rigidity of the trailer if we begin fixing these things without removing the shell?
Here are a few things to keep in mind if anyone is going to tell us a shell-off is the way to go:
A. We are on an rv storage lot.
B. We don't have a lot of cool tools. We MAY be able to borrow a few.
C. We are trying to do most of the work ourselves - for the shared family experience and to keep cost down.
D. We want it to last a wonderfully long time.
E. We're planning to build our own furnishings and really will not want to rip them out anytime soon.
F. We're planning to live in her full-time with our children for at least a year, maybe even two. Our first move-in date was July 31st.

Ha, ha, what a joke!
Well, there you have it. Heeeellllpppp! Especially any advice from people like Andy from Inland RV. (I tried calling in response to your email, but you were busy. I bet your phone is ringing off the hook constantly. I consoled myself by imagining that you had been so busy giving advice to all of us forum folks that you hadn't even stopped to eat yet, and you were about to faint dead away.

)