Are your bedroom floors carpeted? Mine are - and I think most coaches are.
I had popping and creaking with my "tile" floors which was due to the tiles coming loose. I could see the tile movement when I stepped on them. I ended up removing all the tiles from the bedroom entrance to the kitchen entrance and re-setting them with epoxy thinset.
But if you're hearing popping and creaking from under carpeting, then that would mean the plywood subfloor has come loose. In that event, I think the only fix is pull the carpeting back and find the broken screws (and/or add additional screws).