Anyone knowledgeable about fifth wheel construction?

The nose section sits on the sturdy floor. The wall structure is one piece lifted into place. I would assume the nose section is bolted down to the floor since(in mine) the frame ran inside the wall(in the coach) and was covered in carpet. The flooring extended out beyond the frame to allow the nose section to rest. You will probably have to drop the fiberglass around the pin to access these bolts. That's were I would start. Hope this helps.