I was where you are about 8 months ago, plus weak by the bath. Seeing how the only thing that supports the shell is the plywood floor I ripped it all out. Good thing, all around the parimeter the plywood was weak and delaminating, insulation all used for rodent nest. Never would have got rid of the stench of mildew, droppings and dead criters. Found a cross member weld broken at the frame rail and a couple bare wires, critters had chewed off the insulation. Its more work, but worth it. Especially with a '60 TW.