I use stainless steel steam table pans,with lids.
I get mine used from the scrap
yard.
I heat them in the oven then spray the insides with a oil/water mixture,before adding my loaves.
The result is a seasoned surface much like cast iron or
carbon steel.
The loaves are nice and square, and the oven space is used efficiently.
Since I'm doing no knead,I cover my pans,either with lids or with with sheet pans,for the self steaming crust effect.
I have some cast iron loaf pans,but I usually use them for quick breads, cakes and meatloaf.