Thanks.
Yes - everything detached.
The coroplast hatch and side panels came off with four bolts.
Everthing rides on a "shelf" that was held on by a heavy duty ratchet strap. ( 10,000 lb ) that connected to tow hook on the frame.
The ratchet strap is wrapped around the inner bumper and feeds through and comes out the bumper cover.
The cables you see in the photo holding up the floor are temprary placeholders at that time.
They actually connected to bolts on that "shelf" to help it from drooping.
The drooping problem is a big one.
The whole assembly wants to slide downward on the bumper, no matter how tight I have the ratchet strap.
If I return to this project in the future, I will ask for advice as I go.